Excessive weeing in 6 year old

[Amandella]

My daughter has recently started peeing all the time! She doesn't seem ill at all, she says that it doesn't hurt her (no itching/burning or anything) and she has no excessive thirst - just drinking normally. Nonetheless, we just got back from a restaurant and she had a large glass of lemonade whilst there. She went to the loo twice during the meal and 4 times within a 2 hour period since we got back. This can't be normal!!?
She doesn't appear distressed by it - the wee looks normal enough - not particularly dark or anything but she does seem to go all the time! She goes at least once in the night although never wets the bed.... anyone got any ideas??
Thanks!