Mental illness has more stigma than medical illness. Maven, the behaviour of your mom and loss of trust with her is much like my family(mother, sister, brother).

I have a "email sister" for gosh sake who I trust more than my blood sister. It's because we both suffer from mental illness and support each other though we live a long distance away from each other. And I don't feel bad that I trust Internet sister more. I look out for her and worry about her within reason.