Since there wasn't a guide for it, I thought I create one

In the middle of the room there is a broken walking bridge
Climb on the end of it, facing towards the broken off part

When she climbs on, beat her repeatedly until she falls off
Then just repeat and rinse

A few tips:

• If you fall off yourself, climb back on asap using the back of the ramp to the side
  
• If she does the aoe damage on the ground, double dash back quickly.
  
• If you need to recover some health, it usually gives enough time to just jump off then use the ramp on the side to run on via the sloped side and then to jump onto the walking bridge again

This is how I beat her quite the easy way

Hope it helps