Through exceptional use of flashback, Meredith finally remembers that her mother was pregnant following her attempt to commit suicide.

Does Meredith Gray try to kill herself?

So when a ferry crash leads her to the scene by the Puget Sound and she accidentally falls into the water, she doesn't try to save herself. Luckily, Derek saves her, and after toying with the afterlife, Meredith ends up being OK.

What episode does Meredith try to drown herself?

Drowning on Dry Land is the sixteenth episode of the third season and the 52nd overall episode of Grey's Anatomy.