For the past couple of weeks, DD (2.5 years) has been biting, chewing, and eating nonfood things. Mail, magnets, plastic bags, hairbrush bristles, etc. Yesterday, she took my library book and bit off some paper and began chewing it. Like a dog. When we try to get her to spit out whatever she's chewing on, she says, "No. I will NOT spit it out," and then covers her mouth with both of her hands. If it's something more serious that she needs to spit out, we will try to pry her jaws open, but this makes her swallow it and happily say, "It's gone!" It's impossible to "baby-proof" her because she's literally eating anything.
What do I do? Just a phase? I've tried talking to her about eating non-food, but she's also in a super defiant stage, so if I tell her to not eat paper, she says, "I WILL eat paper." Or, "plastic is GOOD to eat."