Purple, you still haven't answered as to whether or not your mum knew she was leaving you w/ a paedophile. And I'll add, if not, did you tell her when you spent time together later on? And, if so, how did she react?
" 'My earliest memories are of feeling crushed, devalued & unimportant'. There is no blame (there)."
Oh, honey, as notanan said, yes there is. I'm sorry, but no matter how you describe the pain of your childhood, I imagine she is going to take it as an accusation. What else could it be? She either caused or facilitated a lot of what hurt you as a child. She may feel guilty about it now on some level, but chances are the guilt is too heavy a burden for her to bear. Maybe not. Just a thought...
"If she's not able to hear my experience then there really is no-one there to connect with. However, if she now can, then there is the potential to begin to slowly grow something new."
Again, you can find this out through letter-writing or even email. As others have said, it's very moving that you'd like to begin to "grow something new." I fear, though, that you may be holding onto some childhood fantasy of your mum being the kind of mother who is always there for you, ready to provide comfort and emotional support. And I'm so deeply sorry, but I just don't think she has it in her. Not her fault perhaps - she can't help how she is, I suppose. I just don't want to see you get disappointed and hurt again.
If you would simply like her back in your life, you may have to accept that it will have to be on a superficial level, just having fun together, etc. Please don't expect more than that.
And please let us know what you decide.