So you managed to beat her on the first encounter, without any cheats? If so, how?
She is beatable later, but it's intended the player will lose that first encounter.
Contrary to the other commenter I actually assumed the grass shroud was
intended as physical negation and thus didn't even try Decisive Strike against it. Spark only does like 2-6dmg so that didn't matter to me.
The main point is that almost everything is RNG. Excessive, bullshit RNG stacked against you, but still RNG. With no hard fallbacks. As far as I'm aware she could spend the entire fight rotating between grass shroud, choking you break out of on the first try for minimal damage, and bragging/insulting you/making demands. I was lvl1 with the mining pickaxe from the cave, the health gem for 600 Resolve, Decisive Strike and the one healing potion you can loot in the Inn's upper floor. I also had around 200g or so to spare which might buy another potion or buffer for poorer performance in regards to round rewards.
Strategy wise there isn't much worth mentioning other than a bunch of resets, as you'd do with a difficult RNG-heavy boss in Final Fantasy or Dragon Quest too. Hope she spends a lot of time in grass or immediately broken air early on (high hp=better escape chance), or just taunting/insulting you where the debuffs tend to drop from all the grass stalling and element swapping anyway. Chug potions during grass or the first turn of choking if you have more than 1. Use Decisive Strike immediately unless you expect her to waste your following turns of boosted ATK (e.g. she just swapped to air and you're at <300 hp meaning you'll heal then break the choke next). She seems to be scripted to heal pretty reliably around 25-40% hp, a single heal is manageable with the above loadout but a second one is problematic and would require very favourable RNG to still win. Getting frozen tends to be game over as well as she can just spam it back-to-back with no repercussions, switching into rock with the boosted ATK at low health also hurts.
I must say if this battle is
intended to be an inevitable forced defeat you went about it in the worst possible way. The heavy reliance on RNG means there is always hope for a winning streak, the attacks are too weak individually to give a sense of being completely outmatched, and at least fanning her even
benefits the player as a combat action suggesting developer intent to actually engage with the fight rather than just surrender immediately or spam Wait. Contrast that with the first battle against Lux which starts out manageable, but then clearly transitions into "I was just holding back" and outright oneshots you.