A sign of MBD in frogs can be an "underbite", or the bottom lip of the jaw sticking out. You usually see very little of the yellow in their mouth when it is closed, but thankfully Packie's case doesn't seem too bad. Judging from what you write, this likely occurred in her first home. It's great she's so enthusiastic about eating! However, it's still good to be cautious. MBD can be a slow, sneaky monster; an animal can still behave normally before it worsens and more worrying symptoms appear. As long as you keep dusting her food, she should be okay!

As for the vet, she is eating and behaving like a pacman should, so I wouldn't worry too much. In Packie's case, you would just want a vet to give her a look over and make sure she has good bone density.

EDIT: Also, I tried to do some digging for possible morphs and Underground Reptiles has a Lemon Albino that could be a possible match!