Will the insurance company pay for this?

Siblings taking mom (94) to emergency room just to get another 100 days in rehab. Siblings do not want to use mom's money to pay for nursing home. She was in rehab for 100 days was sent home for not being eligible for Medicare. My sister took her in for three weeks. Now took her to the emergency room. My mom says she is there for a good check up. Will the insurance company pay for this.