I'm so sorry for the loss of your Mom :(
It doesn't matter how old you are - when that happens you just want to be a kid again and crawl in someones lap to be loved.
Take some time for yourself to grieve, and don't try to get "back to normal" too soon. Your world has changed. Be nice to yourself. Grandchildren will know that Grandma's "hurting" right now. If the knitting helps calm you then go for it! If it stresses you out, put it away for a while!
BE GOOD TO CHARLOTTE FIRST!
(We really need a HUG icon) HUGS