Not sure about herbs to help, but I don’t find natural deodorants to be effective either. I do make one that I have found to be very effective. The recipe is ¼ cup baking soda, ½ cup cornstarch or arrowroot powder, 10 drops Tea Tree EO, and 2-4 TBSP of coconut oil (to desired consistency). I use it like a lotion daily and sometimes at night after a shower. She may also want to try a cleanse. Hope this helps.
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