My sister had a stroke and lost feeling on the right side of her body. Can rehab center kick her out?

Is she there for stroke rehab? If not, what's the reason she's there? They don't "kick people out" but they can discharge her if she's not making progress or showing improvement in rehab.

More information on your sister's condition, why she's at rehab, what her post-stroke prognosis is, etc. would help create more succinct answers.