The solution depends heavily on her age and current behavioral baseline. If she is under 12 weeks, this is likely normal exploratory behavior that can be redirected with play. If she is older or has a history of fear, the approach must be much slower.
For younger kittens, redirecting energy is key. See Kitten attacks my ankles every night for redirection techniques. For older or shy cats, building positive associations with the new bed is crucial. See Getting my shy cat to use the new cat bed.
Also, ensure she is not chewing the slippers due to teething discomfort. Check Kitten chewing on cords and slippers if you notice fraying.