My first son had thrush.... it CAN be hard to get rid of. It's a yeast infection in the mouth and it needs antibiotics.
Are you breastfeeding??
If so, you AND your daughter will need to be treated!
They'll give you an antibiotic for your baby... and you'll get a cream for your nipples.
If you'
re bottle feeding &/or she uses a binky, be sure to wash everything really well with warm water & soap.
Tylenol will help with the pain. Poor little thing!
There is another remedy called Genation Violet... but it stains everything it touches PURPLE... ask your daughters pediatrition about it before you use it, but for a stubborn case, it can help.
GOOD LUCK!!