She's not a very dynamic character.

Jazz is the underdog mercenary trying to catch a break. Spaz is his lunatic brother / comic relief. Lori is... A girl.

Its like...
"hey, lets make the new character a girl"
"How do we design a female character?"
"Well... She needs to cary a mirror around all the time because that's something girls do. This helps the player identify that she is indeed female.".
"Lets make her physically fit, too."
"Great! So we have a physically fit female who likes to look at herself in the mirror."
"Yep, that's a female all right."