Is she low security or high security? I once visited my uncle in one of the more notorious mass corrections facilities. He was in the lowered security one, at that time.
Arrive, sign in, security screen, similar courthouse or airport. Ushered into an open cafeteria style visit room, where other inmates were visiting.
I went a couple times, was about your age. You'll be safe, I'm sure your mom will appreciate seeing you. She did the right thing, even if mistake leading to arrest wasn't.

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