Well, I decided against doing the ultrasound seeing as it's $200+ and she's shown no signs of a collapsed lung or misplaced heart. Now, if she starts showing any problems as a result of it I'll investigate farther. As of now, she's her complete normal, bouncy self! No more vomiting since Saturday and she's back on her normal diet.

At this point, we believe it's just something she was born with. Makes complete sense considering she was the runt and only one to survive out of her litter.