[Gundam][GQX spoilers]

So, after watching today and looking back at previous episodes, I've come to realize one scene back in Episode 5.

The scene where Shuji, Machu and Nyaan are laying on Red Gundam.

Machu reacted the way she did out of jealousy.

She mistook Nyaan's more innocent idea for her trying to woo Shuji with her body.

It's her Newtype powers going into protective jealous overdrive.