I think Mary put it the right way. My Mom passed away 6 years ago this past Jan. 2. You will never forget her and you will have moments where you miss her just dreadfully
I don't want to sound lame but it does get easier a bit with time and I do try and focus on all those good times and memories we had.
I'm glad you focused on your day and spent time with your family...that, after all, is what your Mom would have wanted for you