to be honest it looks like sperm, or a sperm plug. In my experiences older males beardies usually have some kind of clearance of hemipenes after brummation. Usually not noticed, but sometimes pretty gross depending on how active the dragon has been, how often he sees girls, if he's bred etc.
I actually didn't find out about this until a few years after I started caring for dragons, as my first couple were females, and my first male was a hatchling!!
If it isn't a male dragon, there's a good possibility she re-absorbed a clutch of eggs, and she's expelling whatever fluids are making her uncomfortable. It's a variety of things in that case, mostly the lining that makes eggs not stick to them when they are laid, but also compressed fluids that are natural to her, and have just become compressed by either her weight or the weight of the eggs. Sometimes dragons have minor kidney and liver issues, mostly build-ups just like us. Make sure the dragon is passing sufficient urates (the white stuff that's in their poop) and if you notice that she isn't it could signify some kind of kidney malfunction, that does not mean any sort of failure, and is actually a fairly common problem in bearded dragons since they have such a high calcium intake. Don't panic, just keep and eye on them, make sure they are in fact passing food normally, if they are, don't worry!