I wouldn't necessarily recommend going out while the catheter is in place. With ds1, I foolishly took him to the park and the catheter leaked. Mind you, it then continued leaking until we had a new bag put on so it might have been going to leak anyway, but I realised afterwards that taking him to the park was a bit silly. He then only went out for rides in the car - just for a change of scene.
With ds3, I kept him home, but he still went out into the garden, went on the slide, got accidentally kicked by another child and came in bleeding profusely. I thought I had been responsible for allowing him to rip his stitches out, but it turned out to be less serious than that.
So all in all, I would not recommend taking your dd out, but otoh, you have to get on with everyday life, and a trip to the supermarket say would not be impossible.
I too have had a catheter twice in my life and I can back Aitch up from the pov that it does not hurt. When the time comes to have it out, it may well hurt your dd though as it will be in the site of her operation. Both my boys had ops on their willies and the taking out of the catheter was the worst part of the whole experience. I don't want to upset you, but it is better to be forewarned about this.