I think she bought the house fresh out of uni because she wanted to feel anchored and rushed to get a secure 'forever home'. She was still with her ex then right? So maybe she thinking that in just a few years she'd be settled down and starting a family (as we a believe at 22)
Now she's all about boss babe singleness and still very much going out all the time she's realised she wants to do the girl about town thing. I think she'll rent the house to her sisters or cousins who will 100% be paying rent to cover her mortgage