My nephew has cerebral palsy and they have taken away his medicaid?

My sisters husband died about 2 1/2 years ago and now that my sister gets social security they took my 14 year old nephews medicaid away? I think thats wrong how else can she be taking him to his physical therapy and getting him a bigger wheel chair if she dont have medicaid. she cant aford a private insurance and is having a very difficult time. shes the bravest women ever she shows no fear and no worries, but i know shes scared. she also works at the school with the handicaped children. and insurance is also expensive there. Is there anything she can do to get back his medicaid?