So she's feeling better now? It doesn't look like vent gleet to me, more like she might have been having trouble laying an egg or had an egg break inside, could have been soft shelled or no-shelled. The calcium was recommended as it helps with contractions to help her pass anything she might be having trouble with. Sometimes they can have an egg delayed due to difficulty or snafu and another can be close behind, and they can feel awful, especially if it's a soft shelled egg, those are hard for them to pass. If she's doing better then I'd just keep an eye on her.