I totally agree with the ego issues of Jagya... But i have to say all this is results of Gauri's ego issues too... I always had a strong feeling that Gauri is not able to forget her childhood issues ... The things that Gudiya faced... It was fulfilling that void and ego issues of hers which she had lost in childhood... She always had mental issues due to the traumas she faced..
The logical girl Gauri was lost the day she found out he is married and he is the same guy with whom she was married as a child... The Gauri we saw after was Gudiya trying to build her llife based upon the marriage of her childhood.
She hates Anandi as she feels that all the trauma she faced as a child was due to Anandi ... The Singh family accepted Anandi and rejected her.... The girl is not at all able to relate to the reality. The child in her is somewhere attempting to make the victory all hers this time... This is my opinion as i always felt her traumas are somwhere related to her behaviours,... Thats the reason they say, its very important to keep children away from any huge traumas while they are growing up