Just my guess....she is maybe upset as Imlie and Anu had another face off. Yes it's not Imlie's fault... But the way Anu described it to Malini....
I think Malini does have some feelings for Adi.... there are times when I think she is over him and sometimes I think she is not. Yesterday I kinda felt that KC and Malini are catching some feelings as well. Maybe like Adi she too will realize what she felt for Adi was friendship not love.... she too has never been with anyone but him..... She should be sad and mad but at Adi not Imlie. It's evident Imlie loves her (For Imlie it is Amma, Didi, and Adi). Imlie gave up her rights looking at Malini's happy face during the wedding...Plus she perhaps loved him enough to let him go. After PD Malini has decided to fight for Imlie's rights.... it's not going to be easy for her as well....But taunts and guilt tripping never helped anyone get over anything. If she is angry... the anger should be directed towards Aditya. Same as Anu who shouldn't call Methi a homewreker but her husband, Dev. Dev is the one she married, who promised to love, respect and take care of her.... not Methi... Plus Methi didn't know Dev was married.