She'll teach him the basics to build up to this level of casting at some point; silent prowling can be a useful glyph to cast on ones self, for example. For now, however, she nods acknowledgement as she heads off to get the food.

She doesn't feel drained, which is fortunate. And even if she had, the meal York's called in for her would do the trick to settle things. Veiling herself between world layers, she settles back on the couch. Just in case. Once the door closes, she'll will herself to appear again.