The Sapphires seem much more about Eros, though, and that's not Diana's main brand. Indigo would be closer. But of course she's also a symbol of hope for half a galaxy; most superheroes inspire hope, even Bruce is about it at his core when you're working from non-Batgod incarnations of him, and Diana gets an extra couple ticks in the column from her mission being about belief that people can be better (if that's not Hope what is?).
Johns being in charge of this shebang, though, I'll give you that the pinks are much more likely to recruit her from a meta perspective.