She has a changed hairstyle and body lanhuage.
She stammers when she tries to wish Dadi in Hindi.
Family laugh at her and she leaves upstairs disappointed.
Purab bring Cops to Mm as security for Abhi.
Dadi has got a call from An unknown number and they threatened to kill Abhi.
Purab has increased the security in MM for Abhi's safety.
Unknown to them there is a killer among the security people who will try to kill PRAGYA.
My guess:
Looks like Alia did all this so that she can kill P and blame it on some enemies of A.
Even if P escapes writers can happily avoid making A doubt on who was trying to kill P.
Because they all will think the attempt was on A.