“No.” Is a complete sentence. And she doesn’t need to be nice or polite to strangers who are obviously being creepy or she’s just not interested in speaking to. These are things I wish I knew sooner. Also, if she’s uncomfortable or not being left alone, trying to identify another women she can approach and ask if she can sit near them until her stop. Usually we’re aware when other women are uncomfortable. I hope this doesn’t break her spirit or her confidence!