Well, after reading all the chapters up to now, my guess for future developments was way off, and also oddly precise - I had guessed the heroine went for the harem route to actually win over the villainess, but that was obviously incorrect, but interestingly the biggest contributor to changing everything is the heroine's friend who is in love with her and is orchestrating everything to fall apart behind the scenes as well.
Looks like she wants to isolate the heroine so she can be the only one there for her.
So I guess I was right about the dreaded scheming lesbian, but I was just wrong about who it was.