Pretend not to be home
Be hard to get
Wish phones still had cords so you could do this
Mention death
Don't even pretend to care
Tell her your hangover is worse than her hip
Cry sarcastically
Tell her to exercise and stop whining
Play mindgames
Lose your cool Jack Nicholson style
However!
What you should do!
Now go call your grandma and tell her you love her!