I don't like Ana, I truly find her irritating beyond belief but I do have sympathy for her and I believe she could suffer with her mental health.
Ana has never known her biological Dad, got attached to Julie's partner who she now calls Dad but also lost touch with him, has Julie as a Mum (possible emotional abuse + constant critisism growing up), was the sole breadwinner of the family at 16, and has to deal with being a second parent to Bratticus at a young age. Add to that, thousands of comments on the Internet every day about her teeth and unfortunate face, which I would bet my money on are because her Mum didn't take her to an orthodontist.
I do think moving out and away from Julie will do her the world of good.
(Really not here to defend Ana, but started therapy last year and it's made me understand how our childhood traumas really shape who we are today. And I do think having Julie as a Mum could have given her anxiety, just as mine did with me)