kids often dont like their teeth cleaned, just do what you can, maybe try and give it to her to simply chew on. dont forget that other foods contains sugars such as fruit and carbs. is it plaque on her teeth or has it hardened into tartar??? if it's tartar only a dental will be able to remove that. some people are more prone to tartar depending on their saliva which contains calcuim and phosphate which harden the plaque into tartar.