I've lost track a little bit but seeing all the comments about stimulating appetite and kick-starting the rumen - would twin lamb drench be useful? I don't think it would do her any harm at the recommended dose rate and it'll contain energy, vitamins and things to get the rumen going again.
And as to not force-feeding her... well, you can give her drenches. Twin lamb drench as above, PSF (contains energy, vits, electrolytes), etc, can be delivered as a drench.
The only problem with letting her graze to appetite is that she then says, oh, my rumen is nice and full, I don't want anything else... and won't eat the nice cake you've got for her, which she needs.
Good luck with her, she looks a real sweetie, I hope she pulls through.