To be frank I had liked Ishana the day she entered the show and got OmRu into the jail, although the scene was very cliche and was taken frame by frame from an old Hindi movie, still I enjoyed that. It was such a bang on entry, but then she just changed for bad and then to worse
Her so called research on the Oberois which did not find out that Om has a girlfriend was something over my head, and then the CVs have shown that Riddhima tries to leverage her status of being Omkara Singh Oberoi's gf to gain public attention, Ishana should have definitely known that Om has a gf (she even knew about Ashok fire episode which actually was so much hidden from the media), this means she digged so deep that forgot to look into the apparent things
Her decision to con Omkara was the second thing which gave no logic, it seemed that just because she is to be paired with Om, she has decided to con him, she had to get money within few days and she thought of conning Omkara because he might be tough to break but jab tootega to mazza aayega (in her own words), this could make one wonder whether she was actually conning for money (need) or just for fun. She was never interested to marry Om and settle with him, so in any sense her going to Rudra was much more justified, she could have just went to Rudra and he would have been trapped within seconds and asked for 3 crore rupees (with a twist of course), Rudra would have given her that, spent some time with her and dumped her. Don't say Rudra will not have given so much money to a stranger, he had gifted Om's sculpture to one of his gfs when he forgot to buy a gift for him, and we know that the sculptures of Om are sold is crores, so he can give crores to his gfs and then dumped her and wouldn't have even bothered to care for her, usko to paise se matlab tha na, wo to mil gaye
Om on the other hand even she knew was more sensitive and someone who takes things at heart, had she actually made Om to fall in love with her, conned him and then ditched, he would have broken and shattered, I am not saying this should have been her concern (obviously she is a con girl, she should not be concerned for her preys), but wouldn't that be a concern for Om's family and by her research she knew that the family is so influential that they can hide matters as big as someone killing him at the Mahaarti, did she really feel that, that family would spare Ishana and her family for breaking their beloved son??? People she was afraid of a local goon, Oberois could have hired international mafia (police ki to baat hi chhodo) to avenge, did she really feel that then her family for whom she did so much would be safe??
Talking of safety, her sister was in constant threat of being abducted and sold to a brothel, was it not common sense to send your sister at a place which could be safe for her or if not atleast keep her locked in the house, but no she was always involving her in her plans and making her roam in streets and thereby all the more vulnerable
Coming to today's clash, the point you mentioned about Tej and Ishana's Papa difference is very right, Tej wants his son to turn grey, but that turning grey would not put Om at risk, he never does a thing which might hurt Omkara, he actually lashed out on Swetlana and threatened her when Om attempted suicide (alleged) due to the clip episode, Ishana's papa on the other hand saw what risks his daughters are into due to his drinking and gambling and yet did not think of stopping drinking or gambling.
Tej wants Om to be grey because he feels that it would be good for Om, Ishana's papa expects Ishana to be a con so that he might enjoy Tej may not be a Doodh ka Dhula, but in front to Ishana's papa he is way better a dad.
And what was about the line she sad that atleast main jaanti hoon ki main aur meri family kya hai, aap to wo bhi nhi jaante and stuff??? How did she conclude that Om doesn't know he wrongs his family might have done, she knows that Om doesn't even enter the Oberoi office, and works on his own, didn't this simple thing make her realize that probably Om is very much against the wrongs that his family does in business??? And if it did not, how did she conclude that Om is not vocal, she hardly knows him
Coming to the poverty thing, even if we forget for a moment that not all poor indulge into conning or unethical activities, the presentation does not even let us believe that she is poor. She might not have 3 crores, but she is definitely not poor, she uses an I phone (even I don't do that), she travels by Rikshaw to her house (might feel exaggerated, but people in Mumbai would know, even upper middle class people prefer local trains for long distance, long distance Rikshaw is a big luxury here) and above all the simple fact that her father could afford to have a debt of 3 crores show that they are anything but poor. I don't think anyone would give me a loan of 3 crores, howsoever I may need it, because they know that I will not be able to repay it.