I mean, sure it’s possible Bella is just really in love (possibly obsessed) with the MC and maybe she isn’t working against you. She did admit to leaving the bathroom door open so the MC could peek on her back in the day, and with the old man out of the way, plus the MC has grown up/matured a little more, she’s willing to be more forward about her interest in the MC. That said, I thinks it might be a little too obvious to make Elaine out to be the big bad given her past with the MC.
I love fan service as much as the next guy, but the suspense is killing me and hoping the final version of ch. 19 has something related to the main story. That or some more Jenna time to hold me over to the next update!