If one side of her body seems weakened and/or not functioning normally, yes a stroke is likely. It's not as common a cause for the tight circling behavior, but it does happen. If it is a stroke, I don't know what medical care can be done at this point, to help anything. I think I would at least want to try the anti inflammatory meloxicam, and maybe fenbendazole (Panacur, Safeguard, etc) in case the stroke was caused by e. cuniculi. Of course, if at all possible, it's best to try and get her assessed by a knowledgeable rabbit vet.
Other than that, it's going to be a matter of making sure your bun can eat and drink well enough on her own, or do supplemental feedings if she can't. A pellet mush can be made by soaking her usual food pellets in warm water, then syringe feed using a wide tip syringe, otherwise it will clog. Or see if she'll eat from a spoon or dish.
There are also pre-made recovery mixes that can be bought online (eg Amazon, etc) like Oxbow critical care herbivore (bunnies seem to like the papaya flavor best, or sometimes the apple-banana) or Sherwood recovery food. Whatever you use, it either needs to be made fresh each time or refrigerated. And I like to re-warm it before feeding (and check temp that it's not too hot) if I've refrigerated it.
If you've never syringe fed, ideal would be having your vet show you how. But there are videos online. There are some in the link I shared above as well. Rabbits can be difficult to syringe feed if they don't like the food or what you're doing with them. So it needs to be done right for it to work, but also making sure it's done safely so inadvertent injury isn't risked.
There's also needing to feed slowly, a little bit at a time, giving bun time to chew and swallow, or you risk possible aspiration occurring, which can prove fatal if it causes pneumonia. If in doubt what to do or how to do it, it's best to consult with a rabbit vet.
Physical therapy can sometimes be helpful for a bun that's had this happen, to help restore some function and mobility. So may be worth looking into and trying out. Also, take a look at the disabled rabbits site. They talk about how to set up a buns enclosure to help a bun with mobility and balance issues.
http://www.disabledrabbits.com/lifestyle.html
http://www.disabledrabbits.com/housing.html