My family has historically been skeptical of therapy. My mom and stepdad at one point just stopped doing family therapy. As they saw it was helping me my mom came around and went to one or two sessions with me. My stepdad never came around. Some people will just never get why therapy is important and what makes it work. I stopped caring long ago about my family's judgement about my therapy. It feels helpful and grounding and I'll do it for as long as I please. Just don't let your mom's opinion of therapy color your own. It's worth a try but don't pin your hopes on your mom really getting it.