Yes she can

Kelly tries to change back, but something is preventing her from changing. She paws the ground, whinnying in frustration when the old man's voice echoes in her mind.

"I didn't expect this so soon," the voice says. "You are pregnant, which will prevent you from turning back until you give birth. The process however has been sped up, so you will give birth tomorrow."

Kelly is surprised, but starts moving in the direction the male left in.