How can i help my dog deal with my cats death?

We just got a kitten (sammy) 8 months ago and our dog (fancy) became Sammy'ss "mother" playing with him cleaning him and protecting him since day 1.. 5 days ago sammy died suddenly and fancy has been mourning since, she has walked around the house whining, not eating, and shakinguncontrollablyy Im getting very worried about her, do you have any advice for me?