New comic! I think Momo is the only character in QC history to turn down an opportunity for hangouts in favor of actually doing her job. She's coming off as a lot more responsible than the Coffee of Doom crew, or even Marten and Tai. Unless of course she just has some reason to want to ditch Winslow.
It miiiight be a bit of reaction to his new body. I can't tell if that's just the shadow of her bangs, or if she's actually blushing. But the stutter kinda sells me that Momo is on the verge of a freak out. Which would be legit on a number of reasons: She's never interacted with Winslow in a new chassis, and she has to process how she feels about that. It may not culminate in anything (I really hope not anyways) but it's still something we humans deal with. I think we've all had that moment where someone who may not have been attractive before has a moment of change and you have to go "Wow, I never thought about that person this way before. What AM I think even?". It may not culminate in true attraction, but this is a new experience for her. Meanwhile little Winslow is so used to being asexual as an ipod chassis, he's probably not remotely aware that odd skin aside, he's perfectly attractive to other humanoids.
Edit: It's hard to read the intended age of Winslow's chassis. I'm gonna give QC's world the benefit of the doubt that they don't sell chasis specifically designed to emulate children or teenagers under the age of 16-18, since that opens a whole can of worms I don't wanna address. I'm gonna guess both Momo and Winslow's body types as 18, albeit ridiculously slender and short compared to the average human. Getting strong Serah Fallon from FFXIII vibes off these two: Tiny body, but full mature adults. Given Momo's tendency to be interested in anime boy types, Winslow might be triggering some of that attraction.