Sometimes there can be a second egg following the first one. This can cause egg binding. Give the calcium tablet now, regardless of your suspicion she has laid the problem egg. If there is a second egg, it is often shell-less, and even more difficult to expel. The calcium will help.
Also, as...
Her recent history and current symptoms point to possible egg binding. This can be a life threatening condition. It must not be left to chance or she could die.
First thing would be to give her a calcium supplement in a concentrated dose. I use people calcium tablets for this sort of crisis...