I am so envious of your size and age. I love having accidents and do sometimes manage to have them in public. However as I am in my fiftys there is no way I can pull of looking like a little girl. Fortunately I look more like 30s most of the time but still ..anyhow what I do is go to concerts or events with huge crowds. Then drink a few beer and sodas. Once full I put of getting into the bathroom lines until I am absolutely about to go. The lines are usually ten or more people long If I am lucky even twenty. I squirm, dancing about desperate and soon cannot hold it a second longer. I do not hesitate to put hand between legs as it does help hold on a few seconds longer, makes e=certain more people notice and feels so good when the first leaks come. Soon I flood my panties and shorts....
Of course that leaves walking out that way...I am so excited and wet when I get home!!!
I like messing sometimes but I would never try doing that in public unless in a diaper and plastic pants under a skirt.
I admire your courage hon!