you try to hurt her and defeat her

Just run around in a circle avoiding her until she becomes stunned from trying to "shoot"
you (for lack of a better word). When she is stunned, lunge forward, and attack her.

Keep doing this.

You can also run behind Lunar Fireflies and make them shoot towards her. This will also
stun her.

gewoon rondjes om haar heen rennen tot ze duizelig is en dan aanvallen. dat is mijn
advies en zo is het mij ook gelukt. andere vraag weten jullie al wat alle symbolen van het
gouden kompas betekenen en dan bedoel ik alle drie de bekentissen. ik kom er maar niet
uit.

Most people here don't speak Dutch. :)

answer on the question

Normally around her away run dizzily is till they and attack is my advice is succeeded
know mean come then. that and so the me also.
other question you, everything all symbols of the golden comp*** mean, and then I all
three the beak bag. I there but not out.

This is the translation to the dutch text. Yay for free translations!