Gaia dragon is a huge pain in the ass.
Anyone have tips or strategies they know of for her?
Krishna, burn her to ash.
More realistically:
I two shot her with a Urd-->Sanada combo then a full activation (no rows) with Krishna.
What team did you try?
Don't be afraid of her damage shield. Burst as hard as you can every turn you can. Are you able to survive her warm up shots? If so you can last past her 75% shield and do a mini burst to take her down.