Hi there.
Risperidone is an atypical antipsychotic drug with certain
side effects. These are sedation, dysphoria, insomnia, sexual dysfunction, muscle stiffness, muscle pain, constipation, photosensitivity and alopecia. The fall could also lead to local tissue spasm and tightness in the surrounding muscles. She needs to be seen by an orthopaedician to rule out this as an effect of injury ad also check for an missed fractures.