I know way more than I ever really wanted to because I stuggled with it, both in my babies mouth and on and in my breasts. If she thinks the baby might have it, make sure the takes a clean wash cloth (or something with a little roughness) and try to wipe where the thrush is, if it goes away it is just milk curd (that happened twice when I thought it wasn't going away) if it stays on and even gets a little red then it is thrush (it may bleed just a tiny bit but you need to know for sure so you can properly treat it.) Have her do that first. Some new moms do think that if the baby has white spots it is automatically thrush and that is just not the case. If she is nursing, and she has it too she will get burning sensation on and in the nipple, sometimes even deep down. Now that really is a pain to get rid of and take a lot of patience. But that is getting way ahead of the game. Do make sure it is for sure thrush first.