Cream was running for her life from Exebark and Execun as when he was disguised as Cream's mother Vanilla...but later Cream got tired and decided to rest against a tree due being too tired to stand after running for hours but still in the forest near Bingo Festival.

Cream the Rabbit: "Just...got to rest for a while maybe Mister Sonic or Miss Amy will find me."

Cream fell asleep as you stumble upon her.