What next?

Hello! 
I’m after some advice and information from people who have been in the same situation. 
I have a 20month old little girl.

She doesn’t say words (although used to say mama, dada, nana, hiya etc) and barely babbles. She never socially smiles at people, where she used to. She doesn’t really like toys other than puzzles.. loves climbing. She is fascinated with her hands and fingers which I have noticed could be related to her feeling nervous.. she’s stares at them. 
She doesn’t respond to her name, ever.  She doesn’t point to things.. shakes her head a lot.. she never gives eye contact. 
she’s very cuddly with me and my partner but doesn’t notice anyone else. She’s often in her own little world. 

I have concerns, should I? I feel as though my instinct is right.

She has had a hearing test which was ‘inconclusive’ due to her not responding. 
Now we have a questionairre to fill in. 

what happens next and what should I expect in terms of the process to diagnosis and help? 

thanks so much for any responses!

I’d be keen to hear from other people who have gone through it this young and if it was an easy process or complicated! 

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