The 7 Clans of Cats

So, basically, this is my first fan-fic or whatever, so I hope this goes well. Featherkit, Joykit, Opalkit, and Lightkit are born to a beautiful MudClan she-cat by the name of Lintmeadow. In hopes of becoming a medicine cat apprentice, Lightkit often visits the medicine den to speak with the medicine cat, Silvertread. Lightkit and his sisters become apprentices, and all seems well, until StoneClan attacks, killing Opalpaw, Along with two other warriors by the names of Copperpool, and Flowerface. After the fight Lightpaw notices that Silvertread has gone missing, and asks Clawstar is he can search once he has healed the worst of the injured cats. Clawstar allows Lightpaw to search for his mentor, but Silvertread's body is never found. Is Silvertread dead, or is she alive? And how will Lightpaw finish his training if he no longer has a mentor?