You can definitely skip this boss if youre having trouble but the rewards are pretty worth it. The main thing youll miss is the mother of flamlings spirit, which is actually really useful since it lets you summon two flamlings to help you fight and makes all your spells cooldown faster. The area stays open for most of the game though, so you can always come back later when youre stronger and better equipped.

Maybe interesting to know that beating her gives you some extra story bits and a special ability thats really nice for certain fights. The spirit you get lets those flamlings distract enemies, which helps a lot when you want to sneak in some hits. Its not required for the main story or achievements but if youre using lots of spells in your build, youll probably want this upgrade since those flamling helpers can make tough fights way easier.

A lot of players say its best to fight her as soon as you feel comfortable with the combat, because having those flamlings helping you out makes everything smoother going forward. The fights pretty tough but thats kind of the point - the harder optional fights usually give you the best stuff to help you through the rest of your journey. Really depends on how you like to play though and if youre trying to see everything the game has to offer. Its worth mentioning that even if you skip her now, you can always circle back when youve got better gear and more experience with the fighting system.