My two bits on for @rooted-clangen ych!
Root is found by Grandma Crowriver, who was out trying to find a patch of mint. Instead, she finds a kitten all alone on deserted lands. Obviously, being a mother herself, she couldn't bear to leave the poor thing alone. So she takes the kitten back to Frozenclan to raise her. Crowriver is insanely popular in Frozenclan. She's the lead healer, and half of the other healers are her children or kin. Voidstar is her son, and is happy to welcome the stranded kit into the clan.
Root would still become a healer, right beside Crowriver's grandson, and Voidstar's son, Windkit/Windclash. They'd probably get along pretty well, bonding over their shared love of the purple she-cat who helped raise them and her mate, Joob, who tells the best stories.
Also Crowriver's family is absolutely massive. I'll do a tree eventually....