Adriana was in fact there, though when students enter, they'll most likely see nothing, due to the fact that Adriana is actually invisible, and any student with a keen eye would notice that there is light in the room for that reason. She doesn't intend to spoil her students, no; just give them a surprise for their first day.
She's not quite ready for an appearance... yet. Though the presence of the other two students was felt indeed, and Adriana can't help but frown a bit seeing how... uneventful the students are. She'd have hoped that they'd at least make some sort of conversation, but she can't force it upon them either so... she waits. Still invisible.
It's not much, but it's a start. Seeing how no one else seemed to show up, Adriana finally reappears, and says, "Good afternoon, prodigies. I trust you all have had a wonderful day so far. I'm Lady Jennings, and I am your Physical Education mentor. Before we get started, do any of you have any questions?"
"I apologize if I scared anyone. That wasn't my intention at all." she said, in reference to that little happening. She had a feeling that she scared the young prodigy by just... appearing and speaking. She's making mental note of that for next time. "Seeing how we're mostly present though... I'd say we're good to start." A pause for the mood to calm down. "We're going start with one of the more objectively important skills that most elves should be good with... Telekinesis."