Umm..no. It's kinda answered in the end of breaking dawn...but she could be killed, like a vampire I guess. but she isn't gonna get old and die. Bella can still die, edward can still die, renesmee can still die but only if killed, not old age.
i think no she would nt be killed bcoz her father edward is so strong.....and he will be saving her.....well we say rite.......in endd all will come..........happy ending..........