ETB bad stuck shed even with high humidity

[Bogertophis]

That's very interesting. I have not, but I've had for one year (and 3 days), would there not have been other noticable symptoms during that time? Theres some in her enclosure that I can bag up to test, but it's been there for a few weeks (bioactive setup). Is it too late to test it?

Needs to be fresh stool to test. Way too late.

Not necessarily would you have "other noticeable symptoms" over the last year, but you did mention she's had some shed issues anyway, just not this bad.
Can take some time for parasites to reproduce to high enough numbers to cause the more significant symptoms.