Daughter has the whole family blocked on her Instagram

[tennismum17]

(sorry if my English is bad it's my second) My daughter is 11 years old and in year 7. She, like all my other children, has an Instagram and a SnapChat account. ( I agreed to having all my children have Instagram as long as they use the 'private' feature ).
Recently, it has come to my attention that I had been blocked :(. I found out because I got suspicious that I could not see any of her pictures on my feed - I asked her if she had deleted her account and she said no. She said that she just didn't feel like posting anymore.
I shrugged it off at first but then I noticed that when my youngest son(8) was looking at her profile there were new pictures that I had not seen before. I thought it was just a glitch so I went to her profile and it said 'user not found'. My oldest son(15) said that it meant that I'd been blocked 😢.
I confronted her about this and she got upset; she said it was normal for a girl her age to have privacy and that all of her friends had their parents blocked.
My oldest son came to me and said that he'd been blocked by her too, so had my oldest daughter(12). I asked my husband if he could see her pictures and he said no.
So now the only family member that wasn't blocked was the youngest. I asked him to show me whenever she posted a new picture and he did. He also showed me her Instagram stories and there was nothing too strange - she was posting the same kinda stuff she posted before I was blocked. 🤔
When she found out about the youngest showing me the posts she got angry with him and blocked him too.
So... right now I'm don't know what to do because I have no way of seeing what she is posting. I'm know that she is not a dirty girl she would not post anything inappropriate, swearing or anything like that BUT I'd still like to be able to see what she posts. I can also see where she is coming from and I DO think that my children deserve privacy. I just want to find some sort of middle-ground.

So AIBU if I expect my 11 year old daughter to keep me unblocked on all her social media?

P.S: I also need to see their posts to see the comments underneath, I want to make sure there is nothing mean being said.

My 12 yr old is not allowed on any social media, her phone is off from 8 pm and I check it nightly. I don't care if she is the only child on the planet not allowed to go on such sites. Be the grown up, get all the little ones off and stop her using them.

I understand how you feel. Teens nowadays are secretive and doesn't want to communicate or share with their parents. Thy mostly focus on their smartphones and spend their whole day chatting and messaging their friends. I myself worry for the safety of my child when they are like that and I discovered that I am not the only parent who's experiencing it. I read that there are many parents out there that are using parental control software. I was actually hesitant but then, I read this article.. Maybe you this one can help you too. :)
bestcellphonespyapps.com/what-parents-are-really-saying-about-remote-cell-phone-monitoring/

I think that is not a good idea to let the kids using Instagram and other social networks when they are younger than 14 especially if they block their parents. You must tell her to open her accounts for you or she will never use this phone until she is 14. If you do not want to be a crazy parent and want your daughter to love you, you can try to use the Instagram spy apps such as described here celltrackingapps.com/instagram-spy/. They are used to monitor the activity and your child will not even know that you have access to her account.