I do understand how you feel honey, but this is your child. My mum had four children and when she offered to help with childcare I did want her help, but also wanted to do things my way. I said to her as gently as possible that I did really want her help and that I hoped I could be as great a mum as she has been to me, but that I need to be the mum and make the decisions about how to do things for E.
She was on board generally but there have been a couple of times she's not quite agreed with something and we've had to have a brief word to get back on track.
Whether or not you decide to say something, I (& I'm sure others if need be) will hold your hand through the process.
More (((hugs)))