Your analysis kinda recontextualizes the earlier chapters if correct. We've only really seen Suguwa kun's pov and not hers. Maybe she just jumped at a chance to be close to him without thinking about it and offered her place to him.
I dunno if she felt anything before he had moved in since he didn't really see the real her.
I do think that after he moved in and started to see the real her she got comfortable around him and started to look at him as more than a friend and potentially get feelings. We see there are hints of of this throughout the series where she does something that could be misinterpreted, but maybe she was being sincere and actually feels that way towards him. It is her whole real self that isn't as reliable that holds her back from committing to it. She doesn't think that a person such as our MC could be interested in her that way because he constantly has to take care of her AND she is unreliable. She has no confidence that ANYONE would be interested in her romantically. Plus she had an ex and I don't recall the reason they broke up (but it might be because of the way she is) so that might have skewed her perspective.
If she did harbor feelings for him that she never wanted to say out loud BECAUSE of her own lack of confidence that no one would want to be with her then the wall finally got knocked down this chapter. Her bluntly asking him why he always helps her if she is so hopeless and his response of because he is there she can be herself means that he accepts her for who she is and the realization on her face means she can now be honest with herself.
Of course, this could be reading WAY too into it and the reality is next chapter the author will pull a fast one about the like thing and we are back to square one. I REALLY hope that what I said above is the reason, though, as it would frame everything in a different light.