Luckily she's dedicated two eyes and a leg to monitoring her while she operates her tiny haberdashery in the corner, and that leg wriggles around until she can touch the unfastened section of dress. A part of her is marveling that she's managing to operate in such a close space with another person, but then, she's not having to talk, is she? No one expects her to be anything more than a smart monster, which is actually kinda freeing in how lazy she can be when it comes to interaction.

But she can definitely stretch to buttons and catches, and does so. One dress, done up!

... Ah, she's so jealous.