Melissa's age is not very old.
Considering the earlier development of Western races, her age might be even younger than she looks.
She is eager to become stronger.
Su Ziyu doesn't know the reason, but he doesn't mind offering some guidance.
Being a Demon Hunter is a dangerous job; every bit of extra strength means a better chance of survival.
Van Helsing's swordsmanship is wide and powerful, aggressive, and incredibly lethal, but its defense mainly relies on parrying and blocking. Honestly, anyone with even a bit of training in swordsmanship knows this style is not suitable for women. Women's innate physical condition and strength cannot compare to men's; parrying relies on having enough strength and constitution to withstand the enemy's attacks, or else you might block the attack but still end up with broken bones. Clearly, Melissa does not possess the non-human level of physique that true demon hunters have.
