Lost Jacqueline Wilson Book?

I am losing my marbles. I discovered that Jacqueline Wilson wrote more adult-oriented books during the 70s to 80s, all published by Oxford University Press. All nine but one has gone out of print. There's hardly any information about it online. You'd swear it never existed if it weren't for an incredibly detailed TV Tropes page.

I've been able to track down most of her OUP books on the Internet Archive's library system, but there's one book in particular I can't find anywhere. It's "This Girl" (1988). All the usually online book sellers don't seem to have it. Being an American seems to make this search harder -- the closest copy to me is at a library at an Irish university (and I'm in the Atlantic states!!!).

Can anyone help me track down a copy? I've bought one of her OUP books from an online retailer, and would love to have this for my collection.