Any mom ever had a baby with thrush ?

About a month ago I had to stop breastfeeding due to not being able to produce much.
My supply continued to decrease.

I recently noticed my baby girl had her first diaper rash this past week and it seemed like it just wouldn’t go all the way away. She’s never had one since she’s been born! this morning I noticed she had what looked like milk under her top lip and tongue. I’ve tried wiping it away and that helped but when i took my flashlight to examine it was specs of white or white dots on the back like where you swallow. I’m instantly freaked out!

I googled and it seems to be all the symptoms but I thought only newborns got that? I clean her bottles and disinfect them often so I’m lost