Rae wasn't sure how to react to the women. She was happy Muse seemed mostly ok, though high as a kite being flown by boeing 747. 
When the woman asked her what Muse was, Rae wasn't sure how to answer "he's... our guide" she finally said, and moved on to the second question, she was afraid to make up a tribe but she was also afraid of how they might react if she said they didn't have one.
Why was she doing all the talking anyway? She thought angrily, oh right our 'guide' is high as heck and i'm the oldest. She groaned in her mind and said "we don't have a tribe, we were just seeking shelter from the desert and this looked like the safest place" after looking them over again she added "if we're trespassing we can leave"
Please tell me they let us leave, she cried in her mind, though she doubted they would.