In a medium saucepan mix together:
2 Cups flour
1 Cup salt (maybe a little less)
4 teaspoons cream of tartar
2 Cups warm water
2 Tablespoons of oil + a teaspoon more
1 or more teaspoons of food coloring
Next cook over medium hear for 5 minutes, stirring constantly. It can burn easily, so really stir constantly. Test for readiness by squeezing a piece of the dough. If it is sticky keep cooking, if it is springy, it is done. The dough will get VERY difficult to stir, and you may think it isn't working, but keep going, it will work, almost like magic.
This Play Dough keeps for a VERY long time if stored in an airtight container. These pictures were from my daughter's birthday almost 6 months ago, and she is still playing with dough we made that day.
To my sweet niece, I hope the dough helps brighten you day! Have fun, and feel better soon!