She still only very young so you cant expect too much. Most pups dont leave their mothers til 8weeks.

It was hard work for me with my dog. I had him from just 5weeks. Keep putting your dog in the area you want her to go and if she does it inside try to stop her mid flow and take her outside then praise her.

I know it's frustrating but she will get there. Dont be too harsh on her for her mistakes as it can make things worse. Concentrate on praising her for the good things she does. Reputition is the key. She will get there.

Good luck