Her life revolves around her parents,her friend Mansi and her son Ansh.And she is bound to trust those persons cuz they've stayed with her thru her rough phase of life.
I think to sum extent,Mansi is the reason for her behaviour.
Regarding the talking issue,Aarti is as nervous as a bride during her first marriage which depicts her naivity.
Whenshe sees Yash closing the room and advancing tiwrds her she feels nervousness above fear.
She hides her nervousness by anger which leads to confusions!
But I basically think Yash communicated to Aarti thru prateek which is a gud move by the cvs..