She first appears in the episode entitled "Rose" which is the first episode of the new series, episode 1.1.
There aren't any episodes where Rose is in a coma ???
in the episode the end of the world
Yes, Rose returns from the parallel world at the end of episode 12, at the end of episode 13 The Doctor returns her and clone Doctor to her world to live their lives together.
new earth
Journey's End (series 4 episode 13). - Edit: Episode 14 is Journey's end.
No she is not coming back. Her last appearance was the 2010 episode The End of Time.
i don't think she is :/ or maybe I'm wrong :)
The Empty Child and The Doctor Dances
New Earth (series 2 episode 1).
she appears in the episode Partners in crime and then comes back later in Turn left
No, she has left for good.
Rose and the clone Doctor kiss in Journey's End (series 4 episode 13). Although Rose and the real Doctor have kissed, Rose was possessed by Cassandra at the time.