"Thank you, Gwen," Morgana wants to say more, but she could not, in good conscience, say she is glad Gwen is here.

Morgana would rather Gwen be at home safe, in Camelot.

So, instead she settles down in the bed, following the implied instructions, and closes her eyes to rest.

It's important to note, that for the first time since Morgana started waiting, she's not going to awake from her nap due to a nightmare.