GREEK TORTOISE HAS RUNNY POO???!!

[Clementine The Tortoise]

My female greek tortoise has been having runny poo ever since I got her. I feed her kale, mustard greens, collard greens and always make sure the type of greens i feed her are safe for tortoises. What can i do to make it less runny and easier to clean. I find im cleaning her cage everyday or else it gets everywhere.