I love the advice Tanza - but how true!
I've found that puppies which leave me fully house trained (usually by their mothers) do often regress in new homes but soon re-learn. If she doesn't pee when she's put outside - take her for a little walk. Always have a word that you use when she does 'perform' when she does go and you'll find this serves you well all her life.
And they regress when they are teething⦠totally... some more then others...