Round 1) Vailyn's power is beyond any of them - while I can actually say that both Shaak and Krayt as Hett are within Vailyn's league as duelists, it's pretty much irrelevant since she doesn't need the slightest focus to murder them instantly; they hold no defense against her power and can die any second Vailyn just gets desperate to kill them if she gets pushed in a combat.
Round 2) Obi-Wan dies off the bat, he's non-factor here. Thanaton's power should be around Darth Caedus level (although he's probably inferior, but still around), but that's still not enough for Vailyn. Vailyn wins every time possible.
Round 3) Superior duelist than Luminara, around Kas'im in combat skill, and wields power beyond their imagination. Luminara was, at best, pretty close to Asajj and capable of matching her power at least for a time; she couldn't even overpower Asajj with the Force, so I doubt she can survive against Vailyn's power. On the other hand, the duo can collectively pressure her enough in a combat; she would beat either solo in a brutal duel, but against two at the same time her chances are way too narrow. While Luminara can get murdered instantly, Kas'im shown impressive defensive abilities in his duel against Bane; I doubt Vailyn can resort to the Force to overpower them both at once and prevent Kas'im from cutting her down, if she uses the Force in the critical moment. If Luminara falls too quickly - which she definitely can - then Kas'im is screwed though. They are equally screwed if Vailyn resorts to the Force before the critical moment (where she may not be able to save herself from Kas'im with the Force, having to divide attention between the two). I give Vailyn strong majority.
Round 4) Ventress is a non-factor in terms of the Force, but she's a superior combatant, as Marr is, who can also hold some defense against her Force power. Marr can't beat Vailyn on his own, but with Asajj's aid they can pressure her enough to kill her and prevent her from overpowering Asajj with the Force given Marr's presence. She stops here.
Round 5) Actually, she would win here kek. She can ragdoll Maul off the bat, Baras can't prevent that as an inferior combatant, and then Baras dies quickly.
Round 6) She can ragdoll either of them instantly lol. She would win that round 10/10, in few seconds if she chose to. Look at Round 1, I won't be repeating myself.
Round 7) Falls, inferior to Yoda in everything.