perhaps i would would join you 2 ladies in the conversation...<br />
if you want make them feel they belong, then you gotta stay with her like she's a true friend, do not hangout with those so-called "loser cool kids" bullying the weak and innocent. show her that no matter what your social status is [or is so, you don't believe in social statuses] you'll be a true friend in need. don't be blinded by those "loser cool kids" out there. be cautious of their plans.
Just do exactly that. Be there for her. Talk to her.
If it's a female friend, just be there to listen.<br />
Men require solutions and suggestions however.