Oh good. Give her some human calcium 1/2 tablet or 1/2 a Tums if you have any. You could also grind up a whole egg shell, and mix it with a little cooked egg. Repeat the next couple of days. Here is a good link about prolapses:
https://the-chicken-chick.com/prolapse-vent-causes-treatment-graphic/
https://the-chicken-chick.com/prolapse-vent-causes-treatment-graphic/