In a split second woke up today thinking my mum was staying with us
I remember feeling that not long after my dad died. Then when you awake fully, reality hits like a smack in the face. It does get easier. 11 years ago, still not a day goes by though when he doesn't creep in my thoughts at some point.
All I can say is when you feeling sad, remember the good times and the memories you shared. She may not be with you but your memories will keep her alive in your heart forever, as my dad does mine.
Big hug from me too.