Ornaments

Working on a piece (Purcell's Rondeau from Abdelazar) with this 10-yr-old girl - she can play it quite well, for the most part, but it's lacking a few (vital) elements.

Me: There are just a couple of things now to make it really good.  Do you know what they might be?
Girl: Well, I don't know if you were thinking of this... You probably weren't... But I thought it would sound, like, way awesome-er if with this note you went like this [demonstrates - instead of a ta A with 3 on the E string, she played 3-4-3, like a mordent].
Me: So, ornamented?
Girl [with that "my teacher's saying weird words again" look on her face]: I don't know what that is.
Me: Well, do you know what an ornament is?
Girl: Yeah - like those little annoying things you have - well, not you, but some people - have around the house for no reason.
Me: Um, yes, to make it not boring but pretty, not so plain... Same thing here.  It's called an ornament because it's making the note less plain.
Girl: Okay, but am I allowed to do it?
Me: Of course!