My goodness hun, I am so very sorry for your loss.
I never know what to say during a time like this....there honestly just isn't any words.
Nothing will ease will ease your pain....except time. I am just so sorry, this truly is incredibly heartbreaking.
May sweet little Olivia Rest In Peace....she is with the rest of the Yorkie angels now, including Toby
God Bless you and hugs to you also....I am just so sorry hun