So, when making a weapon against an immortal deity that has complete control over (local) reality, it's important to remember a couple of things:
1) This is what exaltations were made for. To fight the impossible odds and topple the omnipotent overlords of Creation. And, to compound that, Infernal exaltations were doubly made for that - to break the confines of hell, to regain the glory of the past, to escape the prison of their makers. I think this project might stir some deep, deep memories in Molly. Especially if we go all in with effort (and this might trigger TLF even).
2) Tiffany can boost intelligence of everyone involved up to 10, and that's before any other narrative contribution she brings.
Lash could enhance fey that way technically, at least the ones who pretend to play nicely with some kind of biology, but she probably would not be welcome to do so. That Lore gives her enormous power over her patient.