I'd say you're fine.
If you've got the original layered/vector file for it (e.g. a PSD, an AI) and you can show that you came up with the idea on your own based on the info provided by the client, then there's nothing she can do about it.
Just give her a nice glass of whine, and when she gets too drunk, call the WAAAAAAAAAAAAAAAAAAAAAAAHHHHHHHHHHHHHmbulance. ;)
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