I feel so powerless fosterella to help you when all I can offer is words and my own pain. So much sadness concentrated in a period of 15 days is very hard on anyone's heart. I hope the presence of the kitties' mom and the care she will need from you will help you along. Perhaps later on when you feel up to it you will start another thread reporting on her presence in your life.
I too am so, so sorry this happened with those 3 babies. I thirdly agree with what sarthur said about the mom fostering in need kittens of mothering. Your local shelter very well may be able to use her assistance. This would be good for her, the kittens and would aid in mending yours and your family's grief. An excellent healing mechanism for all concerned.