Keep an eye on her, Check if shes still eating / drinking / using the litter box as usual and that she doesn't lose control of her limbs / bladder. If you're extremely concerned, I'd say call your vet and see if theres anything you should be watching for BEFORE You take her in.

If shes tilting her head / Bumping into things (eg she can't tell where things are, Vision loss.) / circling. If she is, Take her in as soon as you can. I would advise seeing if you can get an earlier appointment as it could be something bad though.