@youluvkay, one of my daughters have “geographic tongue” it makes spots like this on her tongue, they go away and reappear in different spots. When she was diagnosed the ent said it could worsen or be painful if she has acidic things like orange juice tomato sauce etc but it doesn’t bother her at all.
@youluvkay, If you can have her rinse every other night with the salt water. Too much might make her dehydrated because well it’s salt water! Hope her tongue is better. If you don’t see improvement within a few days I’d take her to her pediatrician and have them check it out