Are those correct☺
I packed some cookies without sugar for mom because she is diabetes
I'm gonna practice some exercises for flatten stomach

Question

Are those correct☺
I packed some cookies without sugar for mom because she is diabetes 
I'm gonna practice some exercises for flatten stomach

Answer

"Sugarless cookies" or "sugar-free cookies".  Sugar-free is more of a marketing term - what you might see on the bag.

Answer

Are these correct

I packed some cookies without sugar for mom because she is diabetic.
OR
I packed some cookies without sugar for mom because she has diabetes

I'm going to practice some exercises to flatten my stomach.