Her name is Sam
She is the Soldier of Mann Co's Team PNK.
Sam is a brash, hotheaded girl who cannot take a hint and will often misinterpret whatever currently is at hand so it be on her favor.
It can be said that she is pretty stupid socially and doesn't understand mamy social cues and isn't very intelligent and can be sort of a bully. But deep down she actually does care about the people around her, she just doesn't exactly know how to show it without coming across as weird.