They do not damage her I have no idea why I did that in this run. I think I was trying to soak some spiders so the DPS didn't have to worry about them but running through the spiders can get someone killed so don't do that
I have a commentary video where I sort of share how to maximize DPS as bear but the main idea is - Spend as much rage on Raze/Maul as you can, use Rage of the Sleeper and incarn as much as possible, and swipe less. Using 2 high DPS trinkets helps as well.