Is a facial expression all he’s doing about it? Then, uh, Merrin will literally not notice until she’s done plugging in the armor and headed in his direction anyway.
(This plan was workshopped a couple of hours earlier by a slightly less utterly fried Merrin, who worried that the moment the headband was off her head, she would crash hard, lose what little was left of her situational awareness, and literally forget about the armor’s existence because she now had the attention span and object permanence of a six-month-old infant, and then the armor would NOT BE CHARGED when she woke up and that would be pretty annoying if there ended up being any kind of emergency that required using it.)
In any case, she's going to spend almost an entire minute with 100% of her attention on setting the armor upright against the wall, NOT knocking it over by being clumsy and careless - because she absolutely doesn't have the frustration tolerance to deal with that and she might literally cry - and then on plugging in the cable despite the fact that her fine motor skills are pretty shot at this point.
She'll notice the facial expression a bit once she turns around, but at that point she is so, so close to the goal of being horizontal, and nothing short of Esta getting up and physically grabbing her is going to count as an obstacle.
Merrin has a fleeting urge to also hug him, but that was not one of the remaining two (2) steps on her list. She manages to dredge up what she thinks are the Taldane words for "thank you", suppresses a giggle at the brief thought that what if they aren't the right words and she just said gibberish to him instead, and then turns and walks to the room and lies down on the floor.
(Merrin is not, perhaps, making “good” decisions at the present time. She doesn’t normally sleep on stone floors; there is a bed, in the common area, even if it hasn’t seen a lot of use since Merrin was mostly replacing sleep with powerful magical healing and Esta only needs two hours per 24-hour day regardless. She just…didn’t feel up for navigating a social interaction over it, or being physically in the same space as Esta at all. Waking up incredibly sore is a tomorrow!Merrin problem, as is the part where she’s running a significant calorie deficit and her eight-item plan did not include eating any food.)
She’ll be asleep much more quickly than usual.