I definitely would give her the critter care again, and if you can call the vet to leave a message on the machine today, I’d do that too.
I think a call back from the vet (I know it’s a holiday) if she checks her machine will be the best to just describe the symptoms so she can either plan to see you with an appointment tomorrow or let you know if it’s more urgent. If she’s still pooping, I don’t think it’s an emergency yet.
What did the vet say it was last week? She must have told you what she thought was going on when she gave you the treatment. Please let us know, because the vet had direct information about your bunny, and we are only speculating. Guessing online can be more alarming, or inaccurate, than an exam by your vet. I’m interested to know what you were told. If critter care was the treatment, and the symptoms are the same today, then I would suspect the problem is the same still and not cleared up completely. So yes, do go to the vet tomorrow when she opens, but for now you’re doing the right thing and I just urge you to call the vet as well.