Answer:
The term 'foxheart' in Warriors means someone who is frightened and does not have any courage. Foxheart herself was deemed as foxkit when she was born. During her warrior ceremony, Cedarheart said "StarClan honors your energy and commitment, and we welcome you as a full warrior of ShadowClan." Cederstar noted Foxheart for her energy and commitment instead of her heart. Foxheart was arrogant and immature in the book Yellowfang's Secret because she loved Raggedstar, who didn't care about her and instead fell for Yellowfang, so Foxheart treated Yellowfang badly during then.