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Do you mean only one wet today without poo in it or only one wet nappy and nothing else?
If she's only produced one wet nappy over the last 24 hours it's not OK and a sign of dehydration. You need to take her to A+E.
If you mean every nappy has some poo in it as well as being wet then that's absolutely fine and normal.
Breastmilk has a "gut rush" effect on the bowel, particularly has a "gut rush" effect on the bowel, particularly in the early weeks, and is one the reasons BF babies are at a lower risk of gastrointestinal infections- the poo doesn't hang around long enough to breed any nasties in the gut. The frequency of the poos will slow down over time and she may end up not going for a few days at a time, again perfectly normal for a BF baby. She may carry on having at least one poo a day though. There's no hard and fast rules.