She's just super embarrassed that she bought a house under "those" conditions. She likes to pretend that she's upper middle class (thanks to her upbringing) and that Lee can afford her the life she was used to as a kid/that her mum leads. Having the reach that she does have, it would be incredibly helpful to those who were in positions she was in. There is nothing to be ashamed about in needing and receiving help.
Everything around the house sale/purchase is so shady. I wouldn't be surprised if they didn't even buy the house themselves but her parents did. Might be worth the 15 quid to take a peek at the title when it's finally registered (I kid, I kid...) ?.