hey,
if you're still interested - in the episode where we finally see allison's father, there's a lot of flashbacks. at the end of the episode, allison admits, which can also be seen through flashbacks, that she actually was the first to see that her mother hanged herself, and that the story which was told to her (her mother dying in the hospital) was fake.
after that, she reconciles with her father, robert is very happy, and mother finally leaves her alone.
that's what i remember from the episode.