Damage numbers are with elemental advantage, so remember to add ~25% if doing Dark with Dark.

First wave, notice that you can avoid Overdrives from these mobs. Just hit them with normal attacks to Trigger them instead, which takes priority over Overdrive. This Trigger is REALLY finicky, for example, if your last slot kills a mob... the next mob is gonna go "omg I'm under attack TRIGGERED". Normal attacks deal about 1k damage.
Top 750k: Trigger: 2k AoE
Middle 750k: Trigger: Def Down + Affliction Resistance Down (0 damage), notice OD for this mob is Doom, DO NOT LET THAT CAST.
Bottom 800k: Trigger: 1x 4k
Priority: Top, Bottom, Middle. Just make sure that Middle doesn't cast the thing. Or just Middle, Top, Bottom AB if you're strong enough.

Second wave, 6.5m HP:
Trigger: First turn: 100% DoT over 5 turns
Trigger: When Stunned, kill self + AoE Charm (very low chance to proc, can probably just be ignored)
Rage bar behavior: Stuns near death (~5%?)
Overdrive: AoE damage (10k?)

There's two types of wave2s in AQ7, and this is the harder type. That turn 1 thing is a huge FUCK YOU, so you either need to bring Cleanse (not readily available, and make sure to Cleanse on turn2 instead of accidentally on turn1), debuff prevention (not readily available and will be eaten by wave1 Triggers so you need to manual for this) or just one-shot the boss. Failure in doing one of these WILL GET YOU KILLED. Make sure you have a plan! Also, DPS check to beat the Overdrive. High-end Grids will have no trouble beating 5 bubbles.

Wave3, 11m HP:
Overdrive: 3k AoE + Ability Seal (1t)
Rage Overdrive: 4x 6k
Starts with 2 bubbles (can go up to 4)
Trigger: When nobody uses an ability: 3k AoE + Def Down (takes priority over Overdrives)
Trigger: When all four color abilities have been used during turn: BP to self (takes priority over Overdrives, but will Overdrive next turn anyway.)(can happen twice)
~1.5k normal attacks when not Triggered

Wave 1 and 2 are the hardest part of AQ7, since the last boss isn't all that rough. The boss is resistant to debuffs which makes her 11m HP tanky, but it's not a problem since her Overdrives can be avoided and her damage output is SO DAMN LOW. Seriously, why does AQ5 deal like a hundred times more damage than this thing? Anyway, if you have issues with that Rage Overdrive you can always just Trigger her.