Sounds like your mom raised a good kid, who knows what love is.
I have nothing to say that can take the pain away, and for that I am sorry.
I can however, tell you that, energy cannot be created or destroyed. It can only be transferred. Your ability to love, came from her - your love will continue when her time comes. Your love will teach your kids to love, and it will continue when your time comes.

Your mother teaching you to love, has made her immortal. The ripples she has created will radiate through the cosmos. In this way, she will never die.