I may be in the minority here with this opinion, but I honestly do not believe Abbie has the wherewithal or the ability to 'get' or understand what is being said about her. Nor do I believe she will ever understand what being filmed means.
She may not like the camera for numerous reasons. It is just another object in her life that provides no instant gratification. It gives her no food nor does it give her rides as the golf cart does. There is really no reason for her to like it or even be bothered by its purpose. I mean no disrespect to her, but Abbie is not advanced enough to use logical thinking to understand what a camera is or does, she just isn't.
I even question whether Abbie has the ability to 'know' who Abbie is in a photo or on a vlog.
NT kids by the age of 1 know what a camera is. They have play phones/cameras as well as parents who take pics and show the child and tell them "Look at"....(insert the kid's name) I wonder how many times ASSa or Big P has ever done this for Abbie? If they had taken photos from the start, showed them to her, told her it was "Abbie" then pointed to her, touched her as they said her name, with enough repetition and follow up over the years perhaps she might have a connection to a camera. They chose not to engage with her the way parents should so we will never know.
As for being upset because ASSa is talking about her, I don't believe she has the capacity to understand the details about much of what is said during the vlog, let alone to know he is speaking directly about her or her behaviors, etc. She hears her name and might react like a toddler whose brain connects to certain things. In her case, she reacts to food/cart rides/couch rocking/music/Zaxbys and the rest is blah, blah, blah to her ears.
It's not her fault, it is just how she is.
One thing I think we can all agree on is that as humans we have much empathy for Abbie and her situation.