Puppy Potty training PROBLEMS?

My Chia/pom puppy broke her leg at 10 wks old, she was doing great at the whole potty training before, but while she had a cast, she had a hard time going outside. She got her cast off at 16 weeks old, and every time I take her out of her crate and outside to go, she will pee, but then she comes in and pees and poops AGAIN right after. I have even left outside for long periods of time and it is almost like she holds it until she is let in ??!!?? HELP !! She will go outside and pee when I say "go potty" with no hesitation, and I praise her every time and give her a treat, but she still comes in and goes by the door, and even worse in her crate. I do scold her immediately and take her back outside, but it has been almost a month and it doesn’t seem to be improving. She is 5 mo old now, is she just too young to get it!
Also what is the best way to eliminate the odor for her urine in the house so she won’t want to go in that spot again, someone once told me something about vinegar, but what kind and what do I do with it ??