Were you able to get the calcium gluconate like @CayugaJana suggested? This type of calcium is absorbed better than the other types and it is what most vets will give them when they need calcium. I use 0.2 ml per pound orally or by injection in emergencies.I’ll get some liquid calcium tomorrow,

If you can't find the calcium gluconate at your feed store, go to a pharmacy look for calcium citrate.

If you can't get either of the above you can use calcium carbonate.

If you decide to use Tums, read the label! Some Tums are 500 mg, some are 750 mg, some are 1000 mg, some contain something to relieve gas, and some are artificially sweetened. Do not use Tums with Gas Relief or sugar-free Tums because I do not know if they are safe for birds.
The calcium dose I use when using any of the above is ~50 mg per pound of body weight once or twice a day.
Don't worry about her not eating because all she really needs right now is water and calcium.I’m just worried because she won’t touch any food. Drinking tho...
Is she pooping?
Edited to add:
If a trip to the vet is possible then I suggest you take her there. A vet will be able to give her fluids and other drugs that may help her pass the egg.
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