I would definitely put wooden chew stuff in there and make sure your are providing lots of out of cage time and foraging activities.
If she is fishing up the liner on the cage-bottom and shredding it, remove it completely for now and just clean the bottom daily. I had to do this because the paper was a draw.
Avoid grass-type shred toys with a hormonal bird.
No dark/shadowy spaces in or around the cage (that includes under furniture, in clothing, head under blankets or pillows, boxes etc).
No petting anywhere other than the head/neck (no beak either)...no cuddles..no under-wing action..strictly platonic is the goal. My bird will sometimes even get sexual from petting on the head, so you may have to minimize petting in general during this time (even in the safe-zones).
Redirect any regurgitation or other hormonal behavior when it happens but do not attend to it.
No warm/mushy foods.
12 hours of solid sleep nightly = essential for immune and hormone regulation.
Make sure you have a solid light/dark routine and 12 hours of dark/uninterrupted sleep nightly.
Make sure your bird isn't getting too much sunlight during the day (as can be the case with birds housed part-time outdoors)--this can trigger hormones as well.
If this is a female bird, be very careful with egg-binding---this can be deadly if not caught early on. If you think she may lay eggs, a cuttle bone in the cage is a good idea, but remove anything that could possibly be misconstrued as a nesting area.
**ALSO-- when my bird was doing this, I found that placing empty water dishes on the cage floor in the broody-locations (4 corners, in my case) discouraged my "U2" from climbing down there once covered. You might try putting some random unfamiliar (but safe) items down there right before you cover the cage---as in seconds before...worked for me.
