Howling:River Song

This may sound stupid, but I might have an idea. *spoilers* At the end of "Day of the Moon," River Song says that's the last time she'll kiss him. Might this be the last time she kisses him before "Forest of the Dead"? . She said they were moving in opposite "directions" in time. Does she have an idea that her death is soon in her timeline?

Please, if anybody knows otherwise, please say so. I'm sure I've missed something, I am rather tired.