Possible autism?

So for a while I’ve noticed that my 14 month old daughter is different to other babies her age.

She doesn’t speak other than dada repetitively, she doesn’t give out any eye contact and if anyone does look at her she will either look straight through them or will physically move her head to look around them. She isn’t interested in any baby games/songs and hates busy environments. She won’t even play with other children/babies and will physically scream if anyone gets close to her or touches her. She barely smiles or laughs, if I smile at her she will not smile back. The only thing she is interested in is peppa pig (that makes her smile) but any other toys she isn’t interested. She doesn’t wave hello/goodbye. Does anyone have any children who are autistic who had the same signs? I’ve spoken to a few family members and they’ve all said shes just shy or needs to get out more. Or that it’s “first baby syndrome” (basically doesn’t have any children around her 24/7 to copy off)

I don’t know if I’m just being paranoid as her development is quite behind compared to a few other babies similar to her age.

EDIT- I take her to playgroup once a week and even then she doesn’t let anyone near her she won’t move from my side. She hates being cuddled even by me and her dad. She sees her grandparents twice a week and doesn’t even go near them if they try to go near her she will cry dramatically. She sees her cousin who’s the same age 3 times a week and she won’t engage with him. She will lick his hand on the odd occasion(not sure why she does this😂)