She felt a little silly just going out into town to 'shop' simply so that Merwyn wouldn't feel so jealous, but...
Adrien was probably right to defuse the situation like this. Anything she could do to get her fae familiars to stop fighting with each other was probably a victory.
And...
Well.
She also didn't want to hurt Merwyn's feelings, either.
As much as he insisted that wasn't possible, her experience told her he was a more sensitive creature than he let on, and simply letting him stew in his fussy jealousy over all the compliments Adrien was giving Mia would only have ended up with confrontation - probably not just with Merwyn and Mia. He'd have started provoking Adrien, too.
Thus...
All in all it was a smart thing to now be standing outside of their inn, leaning against Merwyn as he looked around the stores.