constipation

Kathy
Hi all,  
My daughter has been constpitaed. We switched to organic whole milk a month ago.   She was constipated really bad a couple weeks ago.  My doctor suggested miralax for 5 days and add more fruits and veggies.  After 5 days of miralax, she finally had a regular stool!  She had a regular stool on Sunday, today is Wednesday and no stool yet.  Any suggestions??  I don't want to keep giving her miralax for her to be regular