Firstly, I am sorry for the abuse you suffered as a child. I believe you.
There is a lot in this post that worries me OP - this situation sounds very febrile, and not one that is very safe for you at all in terms of emotional and mental wellbeing.
You seem to wish to make public (to your local community?) details of childhood abuse you suffered at the hands of your mother. While you have a right to speak your truth, I don't fully understand the details of what this public revelation will look like, and I would strongly urge you to speak it through with a counsellor with experience in working with abuse survivors, or similar, as ANY form of revelation of past abuse is sadly fraught with danger (you may not be believed, sadly may be blamed, etc) - this is true even when revealing historic abuse to a limited circle such as close family members. So publishing it as widely as you seen to intend to, the risks are magnified greatly. I am not saying it's the wrong choice for you necessarily, but it's one that needs to be taken carefully and with your eyes wide open.
To add to this, you also appear to be trying to conduct a positive relationship with your abuser, while planning the publish the details of her abuse. Unless she had done a vast amount of work in terms of accepting fault, making reparation etc, it's highly unlikely that this could ever go smoothly - it would be a rare abuser who happily allowed details or the abuse they had committed to become public knowledge. Are you hoping your relationship with her can continue even after the revelation? Without massive intervention from mediators etc, I really don't see how it can.
Thirdly, you seem convinced that the records you request will have had large chunks redacted when they reach you. To me this suggests you fear your mothers' (and any other abusers'?) power and influence to be extremely wide ranging, if they can organise and arrange evidence of their crimes to be destroyed..... Either you are currently somewhat unwell and paranoid (no surprise if you have survived horrendous childhood abuse at the hands of someone you should have been able to trust,); or, if you are correct about the extent of your mom's powers you are right to think carefully about how to move forwards, and perhaps seek legal advice, if she is genuinely in a position to tamper with evidence (a very high ranking social worker or police officer for example).
It's all fraught with complexity, and you need and deserve a lot more help than Mumsnet and books on abuse can offer you. Have you made contact with any charities that support abuse survivors? If not, please ring one today. They should be able to help you unpick anything.
Take care of yourself. Safety first - physical and emotional.