While the group may be reputable, someone mis-ID'ed your girl. Not a mohave, may be a cinny as stated. I would call her a NUPO.
Rescues get stuck taking in a lot of sick and neglected animals, which is why I would definitely QT her for at least six months.
I agree, she was probably mis-identified. She is in quarantine with her two "sisters" so no worries there. They are all definitely girls, we popped them right there. Thanks for all your input.