Hopefully it has not been a long time. You can try cleaning out her litter box very well & putting in newspapers for her to go on. Then you should be able to wring out or aspirate with a syringe
You can try putting a foil cookie sheet type item on the bottom of the litter box. Eventually they go.
Ask the staff at Pet Doctor & they can check it out with the Vet to get you an answer. The phone number is listed in the Google response section.
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