my heart goes out to you. i recently went through this just weeks ago, there were no two ways around it. it's indescribable, words are inadequate, but what you are doing is undoubtedly the best thing you can do for them. you'd switch bodies if you could - but you're doing the only thing you can do and that's taking their pain away. they have an unwaivering trust and love for you and she'd want nothing more than for you to be there with her. it's hard but you can do it. "if it should be" is a poem I was given by a co-worker when I had to place a former one of mine to rest in 2008. I have it framed w/ his picture. there are thousands out there, but that one tops the list.. here was another that i liked that's more well known, but helped me cope. so very sorry you are going through this.
They say memories are golden
well maybe that is true.
I never wanted memories,
I only wanted you.
A million times I needed you,
a million times I cried.
If love alone could have saved you
you never would have died.
In life I loved you dearly,
In death I love you still.
In my heart you hold a place
no one could ever fill.
If tears could build a stairway
and heartache make a lane,
I'd walk the path to heaven
and bring you back again.
Our family chain is broken,
and nothing seems the same.
But as God calls us one by one,
the chain will link again.