Sadly, there's cleaning... and there's cleaning effectively. Behaviorists recommend thoroughly deodorizing every day until the cat has not used the spot for 2 - 3 weeks (so at least 14 cleanings in a row!) It might be something spooked her in the original tray, so try offering another tray that's similar but not identical, near to the spot she has currently chosen. Try putting her food on the offending spot, as she's less likely to soil where she eats.

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