Beating Gabriella Celesta on Universe Difficulty - Star Ocean The Second Story R [PC Steam]

This is the 2nd time I've cleared this boss. The first time was way back in the day on the Sony PS1. I'm glad 2R has a difficulty setting so I'm not locked to a specific setup. But Jesus Christ...I will NEVER do this again. I'm not doing the fight against her evil sister from the trumpet. Nope, not happening.

I made a metric crap ton of mistakes in the fight, but if it wasn't for the fact I used Bloody Mail that negates all incoming damage at the cost of losing HP while wearing it, and having Claude with a self heal and having as many healing items as possible, I might have given up.