As said above, i think that the only thing left for you to do is remember that this will never go away. That Zara was a beautiful little girl that her mumma will never forget, even as those around her forget. Talk about her, remember her. Celebrate her.

Thank you for being such a wonderful friend. I know thats not why you have written your post above but you really should be proud of yourself!

Remember you are greiving too and you may need to take a break at some point. Thats ok, she has family and a DH. Its not all up to you!

RIP little Zara, im sorry that you couldnt stay for longer!