Constipation to diarrhea back to constipation -- HELP!!!

[Guest guest]

I have a 4 yo daughter with PDD-NOS who has battled chronic

constipation and/or abdominal distension. Upon initiating the diet

approximately 1.5 weeks ago, she had a massive die off with lots of

diarrhea and stomach cramps. She slept poorly, was tired, and looked

not so hot. Her stomach was nice and flat though. Now she is feeling

better, talking better, and doing everything better. Her color is even

better. But her tummy is very distended again. What does this mean

and what should I do?

Thanks! Sophia's Mommy