This may be a dumb question, but does she need to know when you take it? Is it possible to leave her out of the loop?

If you need her to pay or pick it up, could you get your dad to do it instead since he's more supportive? That way your mother doesn't even need to know about it.

When I was younger I eventually cut my parents out of my struggles because they were just contributing to the problem. As nice as it would be to have supportive parents, it's a total crapshoot whether we're born into that reality or not. We can't change what they're like... all we can control is how much we're willing to let them bring us down. The fact that they're related to you doesn't mean they have the right to prevent you from getting better, and it doesn't make you a bad person if you limit your interaction with your parents in order to protect yourself. It's important to have a relationship with your family, but it's more important that you're able to move forward and have a life of your own beyond them.