If Lily was the second gold digger the big twist would be that MC's father was a pedophile.
I don't think the devs want to go down that path...
I honestly don't think that Lily is Dizzy. I think that dialog line, which came short after you find out about the existance of Dizzy in the game, is just one of many red herrings, like Angel having and older jerk exploitative ex.
I posted it because i just noticed it playing a Katy-trio route (so far i played a no sisters route and a Jenna-Jolie one) and it catched my eyes. And suddenly the Lily is Dizzy faction from this forum made sense to me. I always wondered how possibly they could suspect Lily.
As for me i really don't think it can be her. Too young and too out of character. She has grown up in a rather wealthy environment and she's still in her early 20's and she's into young hunk dudes. It's too early, i believe, to be a cinical gold digger or to be charmed by an elderly but rich and powerful man. So, how the hell could she have gotten involved with MC's father? And why would he consider her a gold digger? She sure needed no money from him and if anything happened it should be on a rather short time. Too short to have bothered him with econimic demands.
Also, i think a very important clue is the consideration, relyable because it comes from MC's father himself, is that Elaine would have "killed" him if she knew of Dizzy. So, why, specifically, characterwise? He sure didn't mean just because he was cheating on her. So:
Bella? - Of course, she's Elain's sister.
Monica? - Elaine must have know, at last at some point, that there where something going on at some level with Monica and MC's father must have, lilke, promised that whatever it was, it was a past thing.
Jolina? - Apparently no reason, but i suspect that Jolina an Elaine where aquinted and that the picture of Elaine entering cups of Jo was her going to meet Jolina for some scheming together.
Zarah? - I honestly can't see why. It would have pissed Elaine only on a general cheating way.
Anyone younger, including Lily? - Honestly, maybe just because of her age. I guess a woman who is no longer that young and maybe no longer very confident about herself would go nuts seeing her man screwing a younger hotter girl who could be his daugher, by her age. But it's still very generic.
I still think Dizzy must be either Jolina or Zarah.
Jolina for a lot of reason we already discussed that makes her the perfect culprit with a structurated plan to get the booty.
Zarah because she seems so very unlikely and far from every suspect, which is the perfect plot twist culprit. The one everyone had routed out from the start. And why would she be a gold digger? She seems a genuinely good person and by no means attached to money. But this might be exactly her motivation. Maybe she doesn't care of money. But she cares a lot of Monica, and since their business is crumbeling and this will literally throw Monica and the girls in the middle of a street, maybe she wants the money to save the business and Monica's asset. It could be a very well working plot twist for the end. The only flaw would be that this way there was never a real villain in the story, apart from, maybe, Elaine.