Dog won't wee in the garden?

You can start to train her to go on command. When she wets in the house ignore it, but when she goes outside - just as she is going - say whatever word you choose. She will soon ociate the word with going. To retrain her you may need to go to the park 3 times a day to begin with - she clearly thinks that your carpet is the place to go but praise her when she does it right and ignore her when she doesn't and she will soon be retrained.