More to Yellowfang's Secret

Here is the blurb for Yellowfang's Secret from HarperCollins:

"One secret could destroy them all. . . .

Yellowkit is a ShadowClan cat through and through and she can't wait to become a fearless warrior. Then Yellowkit trains as an apprentice and finally receives her warrior name, Yellowfang—and much to her surprise, she realizes that her paws weren't meant to shed blood. Her true destiny lies as a healer, and she takes her place as ShadowClan's medicine cat apprentice.

But Yellowfang's dreams are haunted by a dark prophecy, and every paw step she takes seems drenched in heartache. As she struggles to separate herself from her warrior past, she realizes that the future she faces is bleak and dim—colored by a devastating secret that could destroy the warrior Clans."

Most people call this book Yellowfang's KNOWN Secret, as she kept the birth of her kits (Brokenstar and two unnamed she-kits who died shortly around the time of their birth.)

But I'm not too sure.

Maybe there's more to Yellowfang's secret than what we already know. For instance, why would StarClan send her a prophecy about her kits dying? Wouldn't it be something that would affect ShadowClan and/or all of the clans? The fact that she went against the Medicine Cat Code cannot "destroy the warrior Clans", as quoted in the blurb.

What do you think the rest of Yellowfang's secret is?