But does she really understand him all that well?
To me it looks like she has caught hold of few weaknesses of RK, the incessant need to prove Dipali wrong and show her that she doesnt understand him and his love. Another would be his need to be the one who is the most successful in his field and be credited for the success (if the credits are divided he wants the lion share).
And she uses these few points against RK amd RM time and again.
Her attempts everytime are shot in the dark. Riling him up is one of the many strategy she tries to use, one of the many desparate attempts she makes. And it hits the bullseye with it because that is RKs weak point.
Acc to me she didnot understand RK's ego would be hurt with heroine centric movie on her own. It was only when she heard Mehul bad mouthing RK's nature that she thought to use it to drive a wedge between RM. It was one of her attempts as nothing else was working not something borne out of understanding.
Its not understanding that Dipali has for RK per se. She has caught hold of his weakness and tries to use it to thevmax everytime, sometimes sucessfully, other times not. Its not understanding, its RK playing into her hands time and again not realising that he is ruining his life with that