Uncommon courtesy?

Okay, tell me if I'm missing something here. I told my homeschool girlfriend that The Boy was cleaning out his closet and asked if she wanted me to save the t-shirts and shorts for her son. She said, "Sure thanks," and she offered Tuesday or Friday of this week to get together. Since the boys haven't gotten together in a long while, I offered a play date at the (free) splash park right near her house. We agreed on: Tuesday, 10am, splash park, three boys. Okay, so far, so good, right?

On the way over, The Boy had a massive nosebleed, so I had to pull over and deal with it. I called her to tell her we'd be five minutes late, and she said, "Well, my son had a leg cramp last night and doesn't feel well. We may not be going." I said I understood, asked if we could just drop off the clothes, and told her we'd probably go on to the park by ourselves anyway. ( I figured that'd give her an "out" for having bailed -- we could salvage a 20-minute trip across town.) We stopped at their house and found them having a quiet morning at home. We chatted for a bit and left the clothes. No big deal.

My only question is, "When was she going to tell me she wasn't coming -- when I called her from the park at 10:30?" My kids were in swimsuits and half-way across town. She and her kids were all just hanging at home. I understand that homeschoolers are notoriously flaky, but I don't think I'm going to call her again soon. I went out of my way to make a play date at 10am, and she didn't have the bare-minimum courtesy to call and cancel at the last minute?

Is civilization in decline when courtesy means "calling and cancelling at the last minute"? Or is it me?