Ragini's character has been shown to be a very strict one. In the first few episodes, she asked for dowry from Jignesh's family when in truth she wanted Nishi to continue studying. Even her own kids misunderstand her when she sends Ranbir to jail, and later she is shown to be the one who brings her back. Her character is always misunderstood by her actions, when the actual situation is different.
Even in Neil and Ragini's conversation which Suhaani overheard, both agreed that it was not Suhaani's fault.
I still think Suhaani is NR daughter. Something very bitter happened, that caused Ragini to separate from Suhaani forever. If Suhaani was a result of Neil's affair, Ragini would have blamed him and the other woman - not Suhaani. It is terrible hurt and denial, that is causing her extreme reaction towards Suhaani.
Feel for Suhaani though. However the good thing is Neil is beside her.. As long as the story is handled with sensitivity it should be good..
Regarding Aarav immature behavior - I would not fault Ragini's upbringing on that. With the limited resources she had - she tried to do the best.. It is extremely sad that Aarav and sometimes even Nishi don't understand their mother's plight... The other kid who was never here - Agam is able to clearly see this..
Anyways, these promos are quite misleading.. So will wait for the real episode to play out.. Good that Suhaani is entering the scene..