See she has learnt her lessons very well now as far as Billi is concerned and I feel even though she might make it look like that She is more interested about her Abbu then getting back Asad, she won't actually do that. See her choosing her Abbu this time will buy her time to stay at KM and attack an unfocused Billi at the right moment.
And if I know Zoyas character well and if CVs are not trying to butcher her character now she will never abandon Asad even for her dad. Her love for Asad is strong and he knows what she means to Asad now. She will choose Asad over her dad but just not show that to that Billi. She might even bring another guy as he would be fiance( if spoilers are true)just to make Billi realize that she has nothing to fear about anymore. Just when that Billi would be convinced about her smooth marriage with Asad Zoya is going to expose her. Don't worry