Aww, she's adorable, welcome to the board. It's easy to see why you were swayed into buying her. I must demand more photos though
I would say no-one on the board will hate you for buying this girl from a pet store, many will not agree, but certainly not hate you for it. Many of us on here bought our first Cavalier from less than reputable breeders, myself included. Our Murphy has no papers, although we did meet both his parents, we were so taken with him we just bought him there and then. It's a common mistake people make after falling in love with a cute puppy.
It's done now, so there is no point in dwelling on it. I would 100% agree with Reptigirl about insurance though. Misty was diagnosed with SM in October and the scan and visit cost us £1,600, which was thankfully covered by our insurance.
Paula - mum to Murphy(6) & Misty(7), and Jerry our cat.