Was glad this was clearable with something non-combo, just to shake it up. Dusted off the old Odindra, co-op with my alt. His autoheals make it really hard to die in most of the dungeon, as long as you end up with 68-70k-ish HP.

Team is really pretty flexible. Various skills help, but you don't really NEED much, besides a laser probably. Mine was (a little) luxury, Odindra/Kaede/Vishnu/Verdandi on both, with RLB finishing out on one and Australis on the other. But probably whatever you have will work fine. Inherits were various Verdandi and MeiMei boards for extra heals/easier activation, and Ra on RLB. Ended up with about 73k health.

F1: cross and kill. Laser is for this floor, you can stall a little or use hastes to get it up. I actually got lucky and skyfalled a third cross, so I didn't need it.

F2: the most annoying floor. Take advantage of her shield and double-cross to get past her resolve, then kill. If you have something to counter her time debuff and locked orbs, it will help, but I managed without it. Her 100% grav didn't actually kill me, though I had no shields (?).

F3: you're at a color disadvantage, but just cross/combo hard and you should be fine.

F4: you can stall forever above 15%, kill when ready.

F5: you can stall forever above 15%, kill when ready.

F6: this is the only real one with some RNG, unless you brought shields or an absorb null, because she can kill you. For me, she was absorbing light/dark/blue, so I made green crosses and combo'd hard, praying for no light drops - one-shotted.

F7: if you are in co-op, she cannot kill you, ever, as long as you throw in a few hearts when matching after the 99% grav or Ascension. You have to really TRY to lose (would only really come from trying to one-shot from above the resolve without full health).
Take advantage of her shields to double-cross a few times without worry and get below her resolve. Then just wait out her (75%) shields, and try to killshot. If you miss, double-cross to get her back below her resolve, then stall till you're ready again. It took two crosses and a couple combos to do 40-45% with shields down - I tried from 60% and didn't kill, so either knock her lower before trying it, or combo/skyfallRNG better than me. With two Odindra for emergency heals and unbinds (don't worry about using an active on the one-turn Horai leader bind, makes no difference), it's just a matter of time till you get the right board.

Would probably mostly work for solo, too, you'd just have less actives, and would probably need a shield in there moreso than you do in co-op.