I'm curious if it's because Kaede jumped in too quickly, and her momentary "what if I don't actually like her" is causing her to spiral on that 'what-if' with the feedback loop making her panic - or, if she really doesn't like Momoko the way she thought she did, and this falls apart for them.
I know she was worried when Momoko went to meet her old friend, and that she seemed to have gotten over that almost immediately the moment Momoko came back and clung to her. Coupled with that, she worried over whether Momoko still saying "I don't really understand love"--so perhaps this is some nebulous "what if this is all just an act/'faking' from Momoko", that she hasn't fully sussed out and identified as of yet, leaving her feeling anxious without knowing why (which, I've found, makes it even worse).
It could even be a combination of things, as there's multiple "unknowns" for Kaede at this point, and they all sorta relate to one another and are all prime fodder for creating a mess of anxiety and worry and fear.
SO, hopefully she can get to the bottom of her unease and her worry, and that she is honest and up front with Momoko about it - like, a conversation where they sort it out together would be ideal, and this series has had pretty good communication between them before now, so it's not even unheard of, here.
But Momoko very much seems to have feelings and love for Kaede, even if she's new to the concept and the sensation of it. Kaede, knowing what she does about Momoko, could be impacted in an outsized fashion by her insecurity over the "realness" of it, but it might require a leap of faith on the part of both of them to see if their feelings are truly there and are reciprocated. I think they are, but.
I look forward to finding out the truth.
And, thank you for the TL work, as always.