Possible dairy allergy?

Erica

My daughter is 14 months old and has had loose/watery yellow stools for about a week (multiple times a day, like around 8) Extremely bloated belly. She doesn’t fuss or anything, but it has turned into a terrible diaper rash. I wondered if it’s an intolerance to dairy, so I cut it out of her diet. She is now going less, but the stool is still not normal. Anyone have the same issue? How long does it take to see results if it is dairy?