I have no idea if she did, but I wouldn't be surprised. If I had the money, I'd do it too after 3 kids. Especially if a large part of my income was based on my looks! Its not really the same as other types of cosmetic surgery that try to make you look like something you're not which I don't think she would do.
Hate her but I don't think that makes her a liar. If you don't live with your siblings growing up, you are effectively an only child and can know your friends better than your 'family'. Unless she's trying to hide something about that woman or their relationship, I don't think it reflects badly on her.
But Lo is bitchy drama gold! I just wish Audrina had told her off more!