Do not be galloping off on the 'rabies' thing. Sheep do get rabies sometimes. However rabies is pretty rare in sheep *and* by no means always involves foaming at the mouth, whereas bloat or poisoning are VERY COMMON and definitely DO involve foaming at the mouth.
The "clover slobbers" that horses get does not AFAIK occur in sheep.
I am soooo not an experienced sheep person, and would urge you to post over at BackyardHerds in hopes that the seasoned sheep/goat people can advise you ASAP, but if it were me I would be checking to see if she seemed bloated (is she expanded in the rumen area?) and considering giving her a bloat treatment. If you do think it's bloat, the thing I have used is a drench of about 1/4c baking soda, 1/2 c tepid water, a few Tbsp of vegetable oil, all shoook up as well as possible to mix it and then dosed with a drenching syringe so that the majority of it gets into the sheep, repeated a few times as needed. I am not offering this as "best experienced advice", just as better than nothing
Best of luck,
Pat
The "clover slobbers" that horses get does not AFAIK occur in sheep.
I am soooo not an experienced sheep person, and would urge you to post over at BackyardHerds in hopes that the seasoned sheep/goat people can advise you ASAP, but if it were me I would be checking to see if she seemed bloated (is she expanded in the rumen area?) and considering giving her a bloat treatment. If you do think it's bloat, the thing I have used is a drench of about 1/4c baking soda, 1/2 c tepid water, a few Tbsp of vegetable oil, all shoook up as well as possible to mix it and then dosed with a drenching syringe so that the majority of it gets into the sheep, repeated a few times as needed. I am not offering this as "best experienced advice", just as better than nothing

Best of luck,
Pat