She is a small gray-and-white cat with blue eyes.
I kind of think hazeltail likes jayfeather
So far Hazeltail does not have a mate but in a chat with Erin Hunter it was discovered that she might mate with thornclaw(thunderclan). !
No, Hazeltail sees Jayfeather more as a friend and Clanmate rather than a romantic interest. Their relationship is based on mutual respect and camaraderie within ThunderClan.
she never died
Hazeltail has not died yet, so no one knows how she will die.
Not so far in the books
Nobody knows yet.
No, Hazeltail is Berrynose's sister! And Berrynose's mate is Poppyfrost.
Toadkit is a black and white tom with gray paws and his sister Rosekit is a dark cream she-kit. Their parents are Spiderleg and Daisy. Also their half-brothers are Mousewhisker and Berrynose their half-sister is Hazeltail.
Hazeltail is one of Daisy's kits that came with her when she left the horseplace to join ThunderClan.
Maybe in the coming books.
As of the warriors book Sunrise, Hazeltail has not yet died.