Three on one, team. Donna's gotten a lot stronger in recent times and is only a bit behind Diana, and Cassie is strong enough to be an additional annoyance/distraction.
With WW being depowered but, slowly gaining her powers, the team lose. They put up a good fight but Thor can just bfr them all or one shot them. He will kill Cassie, and severly injure Donna and WW(While Depowered not in her uber form).
Current, then I'm not sure. I'd probably give the team a majority just because of the numbers game, with Cassie and Donna both having hax lasso options.
Wondy's lasso is basically a win, Cassie's lasso already has a short history of banishing gods, and Donna's lasso controls anyone with a weaker will than her own (...which might not do so well for her, but it's still something to look out for). I know Thor is a good combatant, but 2.5 awesome mid-ranged weapons coming from three warrior amazons at three different angles might be overkill. I'd concede to omni-blast, weather manipulation, and forcefield options, but CIS on he's not going to do any of that in combat against three women.
Classic Wonder Woman and the girls win in a good fight. Cassie might die though.
Current Diana and the girls lose horribly.
Donna's lasso won't outwill Thor as Q99 stated, Cassie's might be bothersome, and obviously, Diana's lasso is the most potent of the three. All at to kill the opponent(s), Diana's nasty enough to go for tendons and muscles and try to lacerate Thor. Bloodlusted Thor has also taken on multiple heralds before, though.
Anyway, current Diana's lasso might not be as potent as Cassie's. Cassie only used it on one god (who was blessed by Ares) and it disintegrated him completely.