I would be leery about a vet wanting to force feed an adult (tube feed). Adults really shouldn't ever need it, unless they are seriously ill, but that's an extreme case. Force feeding is extremely stressful and is usually only used for hatchlings that didn't soak up their yokes. Assist feeding on the other hand is acceptable (putting a small f/t rodent in the bps mouth so it will swallow it). It's still stressful, but no where near as stressful/dangerous as force feeding because it's not invasive. In your case I would give her some more time if she hasn't noticeably lost much weight.
Are you offering her food every week? You'll most likely have the best luck with live rodents since she has been off fed for so long. Do you leave the rodent alone with her at all? If she is shy, she might need to be left alone. If the rodent is well fed and watered you can leave it in alone for 10-20 minutes. Put it in at night, shut off the lights and leave the room. If you want to try f/t put it in at night and leave it in all night, you'll have to throw it away, but it's a shot. You could also 'knock out' the live rodent so it is still alive but stunned.
Also have you changed anything about her tub set up since she stopped eating? You could always try moving her to a smaller tub, I've had luck with that, and a snug hide!
If she starts to noticeably lose weight I would assist feed her.