a lot of mothers fear loosing control of their sons, or they feel that their sons may listen more to their wives after marriage. i think it is the innate competitiveness among women to want to feel the most special. the ek Mayan me do talwar nehi re sakti applies to only women and not to men.
women compete for attention. men work in camaraderie
but ishwari as a character is quite flawed. she has a son who literary worships her and yet she is highly in secure. she is least like a god and more like a little girl with abandonment issues. she sprouts a lot of wisdom where other people are concern, but in no way applies that wisdom to herself and her relationship with her son. she seems to be living in two paraller universes at the same time one where only she and her son exist. and one where she play acts to relate with others.
i think we see ishwari's character in more negative light, because we know she had nothing to fear, nobody did anything to hurt or harm her, her son worships her and sona respected her and supported her point of view knowing it was right. the fact that ishwari showed so much regards for sona, her values and wisdom at such a young age, yet rejects her outright as an ideal partner for her son not because sona is not good enough but because dev actually is in love with sona. while just a while back she was willing to accept natasha because she knew that dev was not in love with natasha. ishwari cares only for her own importance in devs life, and the idea that any other woman could possibly have equal or any importance in dev's life is downright unacceptable. she would rather dev marry a drab girl who blends with furniture rather then he marry anybody interesting to dev.
we as viewers empathize with dev for his obsession and behavior because what happened to him was unfair, he took the decision to separate from sona because he feared loosing his mother, in the same stream we cant empathize with ishwari because her fear was baseless and a figment of her own possessive imagination.
so yess ishwari as a character is one messed up woman. but the character of ishwari is quite close to reality on a psychological bases