A couple of Big Macs, some Ben & Jerry's, and those elbows and knees won't look like lethal weapons.
She's cute (moreso with her hair up) but honestly the poor girl looks like she's been starving herself to get ready to shoot with you. 5'8" shouldn't be that skinny... this isn't mainstream.
Put some hose on her! With that height you could get some great leg shots!