I was referring to this only. Dena hi hain toh blessings do, why say these pathetic things and wish for someone's bad?
Anyway, yeah meenu's reasons for accepting Kunal and parul makes sense. But they also didn't show her showing an iota of hatred towards them. Compared to the hatred she harbored for Mish who was much less of an offender to her.
Bold: Meenu treated Parul as a servant, ordered her around and made her do her dirty work. Meenu made Kunal slog like a slave, she got rid of Kunal’s fiancée and used Kunal to break up Mishbir....so yes deep down Meenu did hate Parul and Kunal and used them for her own nefarious purposes. She also never missed a chance to remind Parul of her ehsaan and that’s how she kept Parul in her place!