Why does my puppy keep doing this? HELP!

So I just got a puppy a week ago. I had a beagle for 12 years, but I was only like 4 when we got her so I wasn’t the one to train her and this is all kind of new to me. My new puppy is a Sheltie named Bailey and she is 11 weeks old. We are in the process of potty training her. I am very consistent with letting her out, but it seems I am standing out there for at least half an hour (which is not good because it is now winter). Even if she goes potty outside, she will still come in and pee again or poop. It seems that she just won’t go outside. We scold her when we see her go inside also, how long will it take for her to be potty trained and am I doing anything wrong?