This story had me cracking up and blushing a bit myself so I can only imagine how you must've felt! xD
I've heard that people can have "tells" when they're using their diaper lol. And on top of that, that often partners/couples where one or both are abdl learn to pick up on these tells sometimes.
I'm not sure how true it is and I don't think I've noticed when someone's using their diaper or if someone's noticed that I'm using mine, but based on what I've heard and some of the responses i'm seeing here I think it's a legit real thing. Plus if you're not trying to be discrete then there can definitely be signs.
There's been times when I've been hanging out with some abdl friends and we'll either be walking somewhere and one of us will "randomly stop to look at something" or we'll be watching a show or movie and someone will stand up to "stretch"...usually tons of giggling and teasing ensues whenever this happens
In your case maybe she's ever so slightly suspicious, but probably doesn't think much of it. But I bet if you told her you were wetting yourself when she called you out on it she'd totally be like "I
knew it!" haha. I think it's funny and kinda cute that some people can tell and has me wondering if I show any signs myself when I'm wetting! x3