Wow. Having read all of this - and been in a similar (albeit non-fashion-related) situation - I would take a big step back and assess the friendship, i.e., knowing her, what can I exactly say to her to cut through all the dissembling, without crushing her feelings?
And how do I handle this in a way that I don't feel resentful and annoyed that my time and attention are being pulled into this repetitive loop?
In this situation, I would say, "Look. You keep asking me for ideas, and what I think. But you keep going back to these particular styles, and then you aren't happy when you look at the photos. So let's look at the photos and figure out what you didn't like about your outfits, and what would have made them something you liked. And go from there."
And while I get that maybe she doesn't want to look like the matriarch-MOTG, and spend a bunch of money on a dress that she won't wear again... sometimes you gotta take one for the team, and satisfy the mob.
Hmm. If you approach it like she's playing a role in a soap opera, and 'let's find you the perfect costume for this program', I wonder if that might appeal to her? I sense there is already drama.
Maybe reference Lisa Vanderpump from Real Housewives of Orange County. She's a bit flashy, but she also has some elegant looks.