Marijuana and alcohol to heal arthritis and muscles aches

My mom suffers from arthritis and muscle aches so she wants me to get her weed because apparently there’s a remedy with rubbing alcohol and weed to the area that’s hurting. The problem is she doesn’t have any medical insurance and we are tight on money right now, so I was wondering has anyone ever heard about this? I mean I do know people who do that but that’s in Mexico where my mother is from idk of any people who do that here in the US