Actually she intruded Vansh's life, not the other way around. It's a choice she made. Now she has to bare with the consequences.
Ofcourse she trusts Kabir, he has been there in her life for long and it's natural, but at times she goes overboard, she must think, before coming to any conclusion, but she is baised.
Biased she is, no doubt.
But I wouldnt say she intruded into Vansh's life entirely. She thought she'd stay at her hostel and work for Siya and spy around the house. Which is why she was surprised when she was asked to stay in the mansion. She even decided to leave after that mobile phone incident.
After that, the cardinal decisions were made by Vansh. Be it her not leaving mansion or marrying her.