If she's eating, you could try to get her to eat some chopped up boiled egg or scrambled egg with some crushed egg shells and oyster shells mixed in, to get some extra calcium in her.
Some of the ladies that were tagged earlier in this thread are active now, so hopefully they'll be on to offer more helpful information. You said that her vent wasn't pulsing, right? Is there a chance something else is going on with her? When did she last lay an egg? Here's hoping she'll be...
I'm not sure about using it on its own. Paired with calcium citrate, d3 helps with absorbing and contractions. Did you feel in her vent for an egg? Did you massage her abdomen during her bath? Like mentioned above, you can use something to lubricant her vent. Coconut oil, vegetable oil...
If you don't have something like Citracal (which is calcium citrate + vit d3) you can try Tums. Citracal works faster, but Tums is an alternative option. Like others have mentioned, move her to a quiet, darkened, humid room, like a bathroom. Increase humidity with a hot steamy shower (of course...