Chewing up pillows, shoes, clothes, blankets, sheets, etc.

Sasha will be 4 in February. She is fixed. She has plenty of toys to play with. However, she has chewed up the cushions on the couch, shes, sheets, clothes, blankets, anything she can get her paws on. I make sure all shoes and cushions are put up where she cannot get them. But she will find something else to chew up. I give her her toys and tells her no to anything else she chews up.

When will this chewing stop? Will it ever? Is she considered an adult dog as a pit bull?

She gets walked for at least one hour a day, unless it rains. She can also go outside and run in the backyard.

If anyone can help to stop her from chewing up things or if you know when she will stop on her own, I would appreciate you letting me know.