Watch out for in her? What do you think she is, the Antichrist? Are you looking for signs?
I imagine she has a certain intensity in her life. Which, obviously, runs in the family.
With the combination of Scorpio rising and sun in the eighth, though, she is probably a very private person. You might not ever know what's going on for her, not because she necessarily wants to keep it from you, but just because she wants to keep it private. Her intensity may be a private intensity.
Another strong likelihood with an eighth house sun is that she'll choose a line of work that serves others and/or is psychological/spiritual in nature. Maybe she'll be a psychologist, or a social worker, or a teacher. Maybe join the clergy, if she belongs to a religion where that would be feasible. Maybe she'll be a writer or a movie producer (eighth house connection to the collective unconscious, folklore, archetypes). Maybe she'll be an astrologer (eighth house suns produce a greater share of astrologers than the general population would account for).