Ok, I have a problem. When I take Sadie out...ANY WHERE she refuses to got potty.... ALL DAY LONG!.

The poor thing I'm waiting for her to explode! I live far from just about everything. There is no place to go for just an hour or so.
I went to a friends house yesterday. She lives 45 min away. I tried having Sadie go on pee pads in my friends house, I tried taking her out. I even tried pulling off the road into rest stop on the way home to give her more time to go. NOTHING works with her. She went 7 hours and she is only 18 weeks... poor thing looked like she would explode by the time I got her home.
Any tips you have to get my baby to GO POTTY when we are out would be a huge help!!!!