the liquid calcium gluconate works the fastest maybe you can get some tomorrow they sell it at Feed stores like TSC. The human calcium is OK use the calcium citrate with D3 if you have it and you can actually use a Tums it’s made of calcium lol whatever you use I would give a second dose first thing in the morning if she hasn’t passed the egg yet it sounds like that’s probably what it is because of the soft rubber egg it’s just harder for them to get the egg out when it’s soft, because there isn’t enough resistance against their contractions but the calcium supplement helps push it through. I tried leaving my pekin in the bathtub for a couple hours, but she jumped out after a while, which was really stupid because she was in there for a sprained ankle so I wish she didn’t jump out and hurt herself more. I had the same question though I wondered how long can I leave her in there? I guess maybe just a couple hours and then put her in a crate or whatever she’s going to sleep in for the night because I assume you have to sleep too

But yeah, egg binding is pretty serious. It can be very serious. let us know how is she doing in the morning .
I am also assuming that you checked her over really well and can’t find any injuries. I was wondering if you have drakes and she could’ve gotten injured during mating. I hope she is better in the morning.