Taken from a beta tester friend so not might be fully correct, but so far the consensus is:

• Very strong ult, looking at 200k with a good build at E0, and most of it are full AoE (you basically spamming LL essentially)
• Actually very close to be a rainbow DPS, as her ult ignore weakness bar along with -25% res shred, and since her ult is her main damage you basically don't have to change comps around enemies weakness with her.
• Can ult 2-2.5t in the right comp, need LC however.
• Debuff outside of turn seems to give her Energy also, for example BS Arcana on new spawn enemies and killing DoT trotter. Kafka with her FU spam also adds a lot of energy.
• Aventurine is looking pretty good on her due to being a few sustains that can proc debuff.

So yeah, she's extremely cracked, consistent AoE nuke that deal insane amount of damage means there's very little contents she can't deal with. And you don't even need E2 like most doomposts.