In the end it is your decision, your choice...if you want to reach out to her and ask all the questions then do so. If you think you will get those answers then go for it.
Same with moving on.....everyone grieves in their own way. Personally death would be harder on me and especially my children. For me, there is no comparison. I just know, from my experiences, I did not start to heal until I started letting go of the pain, anger, frustration and the need to know the reasons why.