I always assumed she switched on the sharingan at the last minute and avoided it by moving behind some rocks... they’re everywhere so honestly the thought she even used a jutsu there never crossed my mind.But we still never see her casting I, so its just as likely we don't see her moving, and the rock looks a lot like the other ones in her surroundings. It isn't really made clear. But if that meant she really has Doton though, the anime will show it again sooner or later, so we wait.
Ot: otherwise good thread. The only other thing that throws the doton thing in the air is these kids’ literal inexperience with jutsus in general. Usually if you don’t hear them say it, the user is very adept at said jutsu. Plus, why have her sharingan shown after the fact unless she did something with it.... like use it to see and dodge more efficiently