My 16 month old DD is very social with adults, very smiley, tries to get peoples attention whenever we're out in public, always shouting "hiiiii" and smiling at people. Loves it when a stranger interacts with her and says hello etc. She also loves to see my friends little ones that are a similar age. I'm not worried about her socialisation at all but my in laws keep making comments that she needs help socialising because she cries every time we see them!! But it's only ever them!
She refused to go in the buggy for a walk we went on which she's never done before and was very upset so DH carried her the whole way round.
The problem is MIL is very loud and her normal volume is near shouting level. She's obviously excited when she sees DD and doesn't leave her alone, as soon as this started DD was upset. I've told her many times to try and be a bit calmer around DD, give her some space and let her come to them when shes ready, but she doesn't listen.
Yesterday whilst I was trying to get her out of the buggy to comfort her, MIL was shouting "sweetheart" "oh what's wrong" "angel" booming in my ear, completely in my personal space too after already asking MIL again to give DD some space. I then said "it's too much, you need to back off a bit and give her some space, she's probably terrified of you" I know I shouldn't have been so blunt but I'm just fed up of never being listened to and always feel on edge around my in laws for this same reason!
She's never been left alone with them, not even in the same room which is something that I can't help either as MIL has a dangerous dog (I've witnessed go for a child before I was pregnant) she's keen for them to meet as she thinks it was a one off event 
I can't ever trust her to be alone so that's out of the question.
DD is fine with my parents and her aunties and uncles. She runs towards them for a cuddle and never cries if we leave her with them for a couple of hours.
Any advice would be appreciated! 