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I am sorry to hear what happened to Peach. This product contains permethrins, which are toxic to cats.
I would wash her again in Dawn dish soap to get everything off you can, then dry her and warm her.
If the seizures and tremors persist, she may need to get methocarbamol or diazepem to control the seizures/tremors. How is she doing now?
It would be good to keep her hydrated. Even better would be going to an emergency clinic for evaluation, medication, IV fluids. How long since she got the permethrin applied?
Yes, getting water and liquids into her is a good idea.
How is Peach doing this morning?