Help please

Dawn 💖 • It`s meee
My 2 year old daughter is pulling out her hair and eating it..She's got a very noticeable bald patch..She's always been a poor eater...She has seen a dietician who says it's just a phase not to worry..I give her vitamins in her drink so she can get what she's missing out on...She's only started to do this previously it was bits of thread & fluff...She barely speaks has only a couple of words Daddy ow and baba...Her Health Nurse has referred her for testing for Autism & other learning disabilities plus speech therapy hope to get the appointment soon...Has anyone been through this & can offer some advice..I'm so worried for her because apart from her speech & poor eating she's a happy average two year old