She has always seen his angry side and that is what she is used to. To suddenly see him being so nice she is afraid to fall even deeper for him. She thinks he is doing this out of guilt (and rightly so) and feels he would never reciprocate to her love that is why wants to keep some distance between them.
It is clear from the last two episodes that she is not angry with him (in that sunrays wala scene it's clear she lives him) but she still doesn't want to build hopes for nothing.
Ofcourse that is just my pov!
Also shrenu is a great actor as far as her portrayal as Gauri is concerned so stop bashing her. Ok bye!