Say something nice (maybe even try to apologize) to Maribeth in the least embarrassing way possible.
You nod at Maribeth. "Hey, I'm uh, sorry about yesterday. I shouldn't of let myself get angry"
She nods in return, although it's a curt nod , "Yeah yeah you're forgiven. Don't hit a woman."
You smile feebly, "Hehe, right. Unless it's a Zerg queen. Sooo~ How have you all been?"
They all shrug, saying nothing.
ask isaac and clark if they were actually friends with maribeth
You ask the two men if they were friends with Maribeth. They both nod, replying and saying they all came from the same planet, and enlisted for the same role.
You look back to Maribeth,saying "About that battle yesterday. I killed a -ton- of Platoon 8. Mhhhm, you should learn from me."
Maribeth replies with a competitive look, "Next time we do battle we'll see who gets more kills then, eh?"