(((WelcomeToTheJungle)))

I can understand where you're coming from ~ it does sound scary. The team's goal is to help you though. Remind yourself of that. I'd seriously recommend being completely honest with them, to help yourself feel better.

Regarding your mom...that decision is up to you. It may help you feel more comfortable to have some social support as you talk with the team about where you are emotionally. Or, you may want to talk with them about the heavy stuff alone after your mom helps you feel safe and supported. Another idea is to have your mom be present throughout. It's all up to you.

The team may recommend that your mom stay or go, but the decision is still yours to make. Very best wishes to you, you'll be in my thoughts!