Welcome to PT!
How old is your cat? A squirt gun may be useful, as Karen suggested. Have you tried hissing at her? I once did when Fister was being naughty and that stopped him.If she's a new cat, give her time to check things out, she may loose interest after a while. You know, it's much more amusing for cats to go places they're not allowed and she seems to know where.
Good luck!
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