I'd be sure she ate lots of fresh green veggies, salads etc.

seems rather odd to go through the pain and expense of so much fancy dental work on a baby tooth. but that's what dentists are for I guess, to give us top buck bad advice. I would have it extracted and simply waited for the second tooth to grow in.

If it's still in there and causing distress it certainly won' be helpful to having a new healthy tooth coming in behind it.