Yes. Her name is Leah Clearwater.
The young Eclipse werewolf is Seth Clearwater. He is a new werewolf, as well as his sister, Leah Clearwater. Seth Clearwater is portrayed by BooBoo Stewart in the movie, The Twilight Saga: Eclipse.
Not until Eclipse.
he was a werewolf
A werewolf
Leah Clearwater. She isn't actually mentioned to be a werewolf until Eclipse, but she and her brother (Seth Clearwater), both turn into werewolves/shapeshifters in New Moon. That's why their dad had a heart attack.
Yes, Quil had joined the pack in the book Eclipse.
the werewolf seth kills him.
Yes. It is very possible for a girl to be a werewolf. :)
A werewolf is a fictional creature. As far as I have seen, the topic of what would happen on a solar eclipse wasn't treated in any of the stories I read about werewolves.
During a lunar eclipse, a werewolf would likely still be affected by the moon's energy, but it may experience a temporary weakening of its powers or a loss of control over its transformation. This could result in unpredictable behavior or a shift in the werewolf's abilities during the eclipse period.
He plays Sam Uley (werewolf)
Jacob Black is talking to Leah at the end of "Eclipse"