Ok so it's getting slightly better again. Second doctor said yes it's thrush and there's nothing else to do but keep using anti fungal creams. I use disposables so I have been doing nappy free before her bath for about 30-40 minutes. Problem is she is scratching it when there is no nappy and making it worse. I just try and distract her.
Her diet is good, I generally don't fee her any junk ( I switched to no/low sugar for myself last year so there's no rubbish in the house unfortunately ) Although she does have a fair bit of bread. Easy sandwiches or toast! Last week it came good and then got worse. So hopefully it will get better this time.