I appreciate your concern regarding your sister
It's really very hard when a family member is affected with some mental illness, may she be healed completely. If she has been stabilized on 6 or 8mg of risperidone, it's prudent to continue the same dose to prevent relapse. If your sister doesn't want to take medications, we have to assess why it is so. It can be because of side effects, or she may still not be completely well to understand the nature of her illness. Don't decrease medications yourself, consult your doctor and discuss. If she is tired of taking medicines everyday, you can discuss with the doctor and shift her to the long acting form of the same medication which is an injection to be taken after every 15 days
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