I wonder if Leonor will take part in an upcoming state visit to Spain. Perhaps she will since she's an adult now. Can't wait to see her first tiara appearance. I bet she'll wear the floral tiara.
I believe that she will if she is available, i.e., if it doesn't conflict with her military training schedule.
I suspect she is more likely to make her debut on a state visit by a fellow European monarch, which would be a more familiar setting (literally speaking as all European monarchs are cousins, albeit possibly distant ones).