Yes. Enlarged glands or chronic tonsillitis is one of the causes for foul breath.

• Chewing unripe guava is a very healthy option for teeth and gums; it also helps stop bleeding from gums and bad breath.
• Include consumption of fresh fruits, juices, green vegetables and soups liberally.
• Chewing mint leaves will also freshen up her breath. Eating apples daily helps in mouth purification too, as it helps remove bacteria causing bad breath.
• Rinse mouth after every meal, especially before going to bed.
  In case she has some holes or tooth decay/cavity, visit a dentist to fix it.