little 1 new to autism

My little niece is 3 yrs old. When a baby she was fully active, smiled. As she got a little older she started doing the usual thing putting things in her mouth, she choked, was rushed to the hospital. Shes never been the same since. We asked the hospital did she stop breathing, could it have been a bit of brain-damage, were were told no and even if she had of stopped breathing it wasnt long enough. We and they have no idea, but, shes just struggling. So shes a big peppa pig fan, and hey Duggie... She does play with certain toys, but is starting to more so. She likes looking at books. When shes staring at tv, concentration is zero. She Stimms with her hands there focus herself, she cant talk...well this is the hard part. She can talk however trying to get her to string words together and sentences is near impossible. Every so oftern when peppa pigs on she joins in with the songs and either sings them with words or noises. Every so often if shes after something she will call dad or mum or nan, she doesnt laugh much, she does when grandad plays with her though. Her little schools useless, does anyone know where we can get help from, or something