We already know Eleven is a pretty haunted girl, and I imagine it's not going to get any better in the new season. After all, she's just learned all about the the horrible trials she faced when she was younger, and she's deeper than ever in the web of conspiracies surrounding the Hawkins Lab. She's met her mother! She's met another person with abilities! This is just the tip of the iceberg. We also know, based on some set pictures, that she'll be exasperated and rolling around in the ocean at some point, so that does not bode well. What's more, her mother seems to be there with her.
Then again, these could be visions or flashbacks of some kind! But with the Mind Flayer taking an interest in Eleven, the blooming conspiracy, and all her past traumas colliding in the same space, it's hard to imagine a season in which Eleven isn't a mess.