I also agree with using the Feliway, though others on here have found the diffuser is a waste, you need the pheronomes to be confined more. One room, and work to getting her a collar with a sleeve and spraying on the sleeve (never directly spray the cat) so the calming sense is always around her.
The diffusers are not meant for a large area, certainly not for the whole house, hence why I suggested to use it in the room she is being confined in.
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