What can I tell her?

I've kept you updated on Rachel and the potty; for being as stubborn as she is, she's been the easiest of the three. She was even dry yesterday morning. She's very proud to be wearing training pants--just like her big sister!

Yes, you read that right. Madeleine still wets the bed--more appropriately, her training pants. We cheer when she's dry in the morning, which is maybe once a week or every two. Dale has woken up wet maybe once in the past year and we don't bother to cheer. Sometimes he points out, "I was dry, too," and we golf-clap. He rolls his eyes.
It's a non-issue for her. We've never made a big deal out of it so neither does she. When staying with her cousin around New Year's, I overheard her explaining that girls just wear training pants at night. It's kind of a relief that she isn't ashamed; still, a little discretion would be nice.

I'm not asking for advice about alarms or that stuff. I know about spare sheets and waterproof mattress pads and she doesn't get any drinks after supper. We're visiting her pediatrician in a couple weeks to make sure there's nothing medical about it; if it's just something she needs to outgrow, I'm fine with that. She's so wonderful in every other way, I'm not complaining. Besides, you don't get to choose what your kid needs therapy for.

The question is, what will we tell Madeleine if Rachel gets out of training pants at night before her big sister? The Boy has to go commando in his pajamas or he gets a rash, plus he's a boy. That made it easy to explain. I know all kids are different, but I think it would be more like letting Rachel drive before she gets her license.