Sorry for deviating from main point of thread... how you can be there for her - I can only suggest what really helped me, this may not be what helps her but I suspect it rather has universal application.
Let her talk about it whenever, however she wants for the first few months at least. If you feel she is dwelling on it a bit unheathily you are entitled to gently suggest this or sympathetically point her in direction of counselling but do not say thinks like 'you've just got to get over it!' (as one now ex friend said to me)
I am sure you wouldn't be so insensitive, as you have posted on here, but it did sadden me how so few of my friends would just be there for me and let me talk. I suspect for some it was just too close to home and would have made them put the spotlight on their own relationships, so it was easier just to push it aside.
I still remember one friend, who when I came to her door, crying because I had just found out that my ex had met someone else, looked horrified and embarrassed, gave me a tissue and then changed the subject and never even asked me how I was feeling when we met a few days later. We are still nominally 'friends' but I found that so hurtful.
So, a listening ear, comfort, distractions, practical help - she may feel overwhelmed trying to deal with everything by herself.