Well like I said, she referred to a female friend just recently. Unless she was making it up to throw you off.
And Holly is her friend, even if she's paid. They clearly enjoy each other's company.
The odd thing about Angelina is that her life is actually pretty private, though it may not seem that way. We know a lot about her, without really knowing anything. Do any of us know what she does in her private time, other than who's she's dating? Just because she's not always going on abouther friends like Jen, doesn't mean she never has any.