Personally, I'd give her calcium for no more than 5 days.
It's fine to treat with the vaginal cream, but I still think what you are seeing is urates.
You mention she laid again but it was just a yolk - no membrane at all?
Reproductive problems are what I'm still thinking. It's unfortunate...
I would go with what your vet has prescribed, looks like she's got you covered.
100mg/kg is a good place to start with the calcium.
I've found that chilled/frozen Coconut oil is much easier to give when treating a crop. My birds like the taste and usually will eat it on their own. On...
Photos of Bernice and her poop?
What do you feed?
I'd go to Walmart, CVS, or similar, buy a bottle of Calcium Citrate and a tube of Miconazole or Clotrimazole. Then I'd stop by Tractor Supply or similar feed store and buy Corid (Amprolium).
Give Bernice 1 tablet Calcium Citrate daily for 5...