Mum always knows everything!

I thought the same thing, lucky I have a wonderful sister. I told her exactly how I felt about Mum (just like you feel). I told her I would not cope with the mother knows best attitude and all the questions that would come with it. She said leave it to me. I am not sure exactly what she said, but it did the trick. By the time I called my parents they were nothing but supportive. No silly questions, just lots of love and support. If you don’t have someone like my sister, just be honest with your Mum and let her know you need her love and support, without the Mum knows best attitude. 
Hopefully things will work out with your Mum. Remember no matter what she will love you. 
Paula xx