How do you deal with her?

Diplomacy

Your chances of winning the fight were quite low.
Especially when she is experienced in fighting with magic and or 50% of what you were told about them.

So far she seems quite passive and your condition makes you think that she has no control over you for now.
You grab your sword anyway. "What do you want?" you say in a calm but still aggressive tone.
While showing the blade of your sword

"hmmm who do you want to impress with the sword" she giggles while saying that

"Again, what do you want?"

"oh oh i have to be honest i'm a little impressed usually you people either attack me immediately or run away" she claps her hands lightly.

"Thank you for the compliment. But that doesn't answer my question, so I'll have to repeat it again?"

"who knows maybe i'm just looking for a new To......" she is interrupted by her loud growling stomach.

"let me guess, you just wanted to steal my food" she looks caught.

In response to her stomach, you reach into your bag hanging from a tree without letting go of your sword and hand her a batch of cookies.
A happy face looks at you, "for me" without waiting for an answer, she grabs the cookies and starts munching them away.

While she is doing this, you take the moment to look at her.
She appears to be a young woman, very slim, she is barefoot but seems to have no dirt on her feet or anywhere else but on her clothes.
She had longer fingers not that it seemed abnormal but definitely longer than average and long enough to stand out.
in generell she seems slim but seems to be quit tall whit out standing next to her you coln´t say if she is taller then you even.
However, you did notice a change in her completely deep black eyes which now appear more human as long as you can see at least pitch black pupils as normal.