my baby has thrush in her mouth could innerhealth for kids help it?

No this is something you need to see a doctor about. They will probably give you drops or gel which needs to be spread around the inside of the mouth and in addition, if you are breastfeeding your baby, you will need to treat your breasts as well

Because Inner Health for Kids is an acidophilus product, it certainly wouldn't hurt to give it to her. It won't fix the problem, but it will help restore the good bacteria in her intestines that is essential to fighting off the thrush. Depending on the age of your baby, you can administer this several ways. If you open up the capsule, you can mix in the powder with either cereal or pumped breastmilk (if you are breastfeeding) or you can add it to a bottle if you are formula feeding.
Like the last post says, the doctor will give you drops or gel. But if you wanted to go a more natural route, there's a product called Gentian Violet that is great. www.kellymom.com/newman/06gentian_violet.html
You can get this over-the-counter from most pharmacies. But keep in mind that this is messy! Both you and baby will need to wear "old" clothes during the treatment regime if you choose that route as Gentian Violet is bright purple and stains! But please consult your doctor before trying anything. Good luck!