Tell her to use Certain Dri. It only costs about $4. It works by closing off the sweat glands in the armpits while you sleep . You can get it at Wal-Mart. I have had the same problem all my life and finally I tried this stuff and it does great. I can finally wear those shirts that fit tight under the arms and not have to worry.

Tell her to use it EXACTLY as the directions tell her. I hope she has as much luck out of it as I have.