My daughter who is 7 now, broke her elbow this summer. She needed an emergency surgery, and 3 pins were placed. She did this on May 28th. We had a surprise trip planned for her birthday, leaving on June 16th. We still went. She was able to do pretty much what she wanted, which in retrospect, wasn't that much. They put her in a soft splint, that half way through our trip we were able to take off. So she was able to go swimming. She still rode several rides, but didn't do a couple of her favorites because she was to nervous.
When did she fracture it? If on Tuesday they say she needs the pin, when will it be placed? I had wished we had postponed our trip just 1 week, in terms of her healing, but we had lots of family going with us who just couldn't rearrange their schedules.
We are fortunate in the fact that we are able to go a 3-4 times per year. I think if it had been a trip we had planned for a long time, and the only 1 we had planned, I would have postponed it until the pins were out. I'm not 100% sure I would have done that, but truly, that would have made the best decision.
PM me if you want to talk, or have any questions. Good luck with your decision, I know it's not an easy one.