Should I get a fecal done?

[Badgemash]

I apologize if I should have posted this in the regular husbandry forum, but I'd like the advice of more advanced keepers.

I'm worried about one of my females, she barely eats, she's a mouser but will only eat one (or rarely two) every 2-3 weeks, which is insufficient for a 1000g snake. Her poop is VERY smelly, and tends to be soft. I think husbandry is good, she's in an AP rack, on paper, with warm/cool zone hides, temps 80-90, humidity 40-60%, no shed issues.

Our local exotic vet does fecal work-ups, I'm wondering if I should give that a try? Could this be caused by a heavy parasite load? Also, if this is a good idea, does anyone have any advice about getting a sample out of her for analysis? If she was a tortoise I'd just put her in the bath, but I'm not sure how to entice a bp to poop.

Thanks!

ETA: I think I can get her to switch to rats once this issue is resolved.