Label is certainly a challenging boss that also functions as a stat check. Have to note that if her snakes light up, she is trying to counter any attacks you make with an attack that pretty much one-shots. Knowing this, a dude can eat an item, meditate, or buff up (Power up! for the win). I recommend having defensive buff spells (yes, they need intelligence but even the weakest form is good) up whenever you can with her while you chip away at her HP.