The sad thing is that dogs have such short lives compared to ours. It sounds like your baby has had the best life anyone could have given her, as for crying, my OH sobbed his heart out when each of ours reached the end of their days and so did I.
The hardest but kindest thing we do for our animals, our friends, is to be with them until the end, comfort and reasure them, ease their suffering and sadly let them go. I'm so sorry you're going through this but I guess she needs you now as much as ever. Take care.