Panleukopenia is a virus-based disease, and can be transmitted though many ways. You should discard any and all bedding, soft toys and any places she likes to sleep will need to be totally disinfected. And plastic or rubber toys that can be disinfected should be, otherwise they should be discarded. And of course the carrier she road in will need to be disinfected and clean before you use it for a new cat. I know you'd rather be safe than risk a new kitty.