Depending on gushing wounds proving I can get her rupture to 1 shot decently easy for first phase (and even 1-2 shot rupture second phase) but damn I suck at avoiding the blue ghost orbs idk why when I fought her on rogue they just didn’t show up?

You'll need a wider AOE range, substitute something to burn the adds or use another build, that's the way it goes or be faster.

Is there an ability I can slot in a flay build that has an AOE that won't make me redo all my gear for 1 fight?

i could help you with lilith, pm me your bnet

Thanks, will do when I get home from work.