10 month old budgie bottom beak split?

by Elise
(Australia)

Hi, I have just today inherited two budgies from my late Grandfather that I am told are roughly ten months old. In mid September the female started laying eggs and continued to do so for around 6 weeks. I am told by the time my Grandmother removed the breeding boxes the budgie had laid over 20 infertile eggs.

I have read she was far too young to lay fertile eggs to begin with, the boxes were in there for older budgies in the avery. She spent alot of time sitting on these eggs until the boxes were removed two weeks ago and I'm told was extremley exhausted and wasn't eating properly throughout the 6 weeks.

When moving her into a small cage to transport my grandmother noticed the budgies bottom beak was split and part of it was sticking into her cheek. She clipped a bit of it back but now has part of the bottom beak missing.

Is there anything I can do for her? Has this got something to with her diet and lack of it for so long? Any advice is gratefully appreciated. The two budgies are the best of friends and I would hate to see anything happen to her to split the love birds up. I haven't seen her eat or drink yet but she still seems fairly active.
The female is the yellow budgie in the photo.