Hello and welcome to the forums!
You have been given great advice above and I agree completely. Any disease or infection can cause severe illness or death in such a fragile bird, and since we are responsible for their well being, it's important to take them into an avian vet at the first sign of illness or any issue so that they have the best chance at healing.
Your little girl obviously has a beak malformation or deformity which may have been caused by either injury, a severe mite infestation, or various other factors. Please take her into the vet as as soon as you can!
Additionally, it's great to have you on the forums. If you haven't already, be sure to read through the forums' many budgie articles and "stickies", most of which have been provided above, to ensure you're up to date on everything!
If you have any questions after doing so, please be sure to ask as we'd love to help!
Please keep us updated on how your budgie is doing soon
Best wishes!