I know how hard it is not being able to give your child the life you wanted to. I will always remember how you helped me, when I Was upset that my son would scream and literally have to be dragged into husbands car during pick ups.
As I have calmed down, and (having dad and MIL give him sweets). The transition has become easier... My son has actually said to me "mom, I'm used to this now". I am amazed at his resiliency and rational way of accepting us divorcing. So far I am lucky because no real conflict regarding son. Husband and I are on the page. All we really care about is that he is safe and away from any conflict. We are both doing our part regarding this.
I Think only children are very tuned in to the emotions of the moms. As I accept the situation better, so does son.
I think that a neutral counselor that would talk to husband and in laws and yourself, reguarding your concerns would be ideal. If you are the one to do it, it might not be as accepted.
I love that you are introducing her to charity work. I want to do this too! You are such a great mom!