This probably isn't going to be as angsty as you expect it to be. The truth is, Elena was just really, truly fucking dumb. There was no way to tell that she had lost her memory; all of the facts and her basic knowledge was virtually gone, and she didn't even realize that she no longer could recollect her memory from before she escaped through a wire fence.
What was she escaping from? She didn't know. All she knew was that whatever was behind the wire fence was bad enough for her to want to escape it.
If she did have her memory, she probably would have remembered that daffodils were completely toxic to dogs. But fuck, they were so pretty. She stared at the flower intensely before making the decision to just...
CHOMP.
This took place two hours ago.
Now Elena's entire body was on the ground, convulsing as vomit trickled from her mouth.
Daffodils.
They were so pretty.