Girls, hello. Can you tell me which specialist I can consult with and …

Girls, hello. Can you tell me which specialist I can consult with and what tests should be done? My daughter is 1.8 years old, she's gnawing on the wall and eating sand. She has been chewing like this before, but not to such an extent. For a month now, she has some kind of mania, as soon as I turn my back, she's already at the wall. On the word, she doesn't react, until you push her away completely. She's already yelled at her and given her a reprimand, it's useless, only my nerves are wasted, and I'm breaking her psyche. I don't want to scold her, but because every 5