What date last year did she lay eggs? One risk when snakes insist on producing eggs without breeding is also egg-binding- an egg can get left behind. I even had a rat snake (years ago) that had an ectopic pregnancy- an egg wouldn't come out because it wasn't at all in the right place- but happily, surgery by a very experienced vet got her thru that (with a necessary spay).
BTW, you have my sympathy- I have dealt with parthenogenesis in snakes before, & I still have 2 aging rat snakes that produced large double-clutches of eggs every year...
I wish I could say for sure what's going on with your snake, but I can't. I hope for the best though.
If you need to find a vet to check her out, this site can help: https://arav.site-ym.com/search/custom.asp?id=3661
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