phoenix rachel could certainly do it, but she was inconsistent as hell. if we use her better feats, she would clearly beat diana. her only chance would be if rachel fought like an idiot (as she often did in a team setting....) and deflected her power via the bracelets back at her for a ko. spiral ko'd her once by reflecting her power at her via a spell. it certainly isn't likely though. i don't think diana could even ko her if it got physical.... at her best rachel as beyond herald though, so, maybe not a fair comparison.
she-thor would obviously be very entertaining and could certainly get some wins though diana is very well suited for that battle. spectrum would be a tough match up since she is energy--be tough for diana's power set to match up so i'd say she could probably take her for a majority.
xenith would be fun, but i'd take diana in that--that type of brawl is in her wheel-house. angela hasn't impressed me like i thought she would. gamora would last a bit due to skill but would lose, especially with some of her recent showings.
sue would be very interesting and could potentially take her if she went for the kill right away. given psylocke's new power levels, it's possible she could make things interesting as well--but only if her tp would work full time. there is both proof she is immune, and evidence that says she isn't....
scarlet witch has showings all over the place, and diana has beaten circe, but wanda can be beastly. obviously cap universe has potential as well.
the characters that have a chance are the ones with the kind of exotic style powersets. she has speed, strength, durability, but even the lasso is a physical weapon. if some of the most powerful women can avoid getting in close, they could take her out.