On and off diarrhoea

DD was 3 in September and has been TT'ed since June. In the last couple of weeks we've had on and off diarrhoea. She will do a poo (fairly solid), then is back on the loo 5 minutes later with a really runny one. Today we've had two that have come out a bit fast and ended up with streaky undies before she could make it to the toilet, but no solid ones. We had 3 goes on the toilet within an hour and all with just a bit in it today.

TT was really easy and she didn't have a problem with it. She hasn't had any changes to her diet lately and she generally eats pretty well. No other big changes in her life lately. She seems her normal self in all other ways. So I have no ideas on this one.

Anyone else?

Maybe she's picked up a bug from somewhere and its taking its time to go through her system? Hope she's better soon xx