You're right that it sounds like not enough, but I'm not a vet and there might be some medication out there that works for longer.
Since she's not eating, I'm sure the vets at the clinic you took her to will tell you the same, it can be a good idea to get a thing with this mush in it, that helps restart her hind gut. It's called fibreplex, I don't know if there is anything with another name close to where you live. I used it myself on my boy.
And next time you take any of your rabbits to a clinic, make sure they're rabbit savvy, not all vets are unfortunately.
https://rabbit.org/vet-listings/ There is a list on this site.
And please do keep me updated, I hope everything goes well with little Oreo.