Medical cannabis help

Grandma of mine is looking for cannabis to help with pain and she has a weird pain Dr who is anti weed but weed actually seems to help her. She's said she's willing to do it because it actually helps so I'm looking for specific strains or any specific tips for the medical dispo to ask the budtenders. She has pain all over her body, I used to give her papa Barkley's rub and it helped but kinda pricy. She said weed can stop her breathing so smoking is a no go. Any help is greatly appreciated my fellow ents. She doesn't like the high and it kinda makes her heart feel odd but I feel maybe tincture might be the right way but also I feel people here might have more help than info I could provide.