First episode they lay out the background for Penelope to embark on her adventure. Many reviewers are taking a shallow look at the premise and assuming she is just running away for no reason. It is made somewhat clear in episode one and more so in subsequent episodes that she is having a crisis of meaning. She is looking at her life and seeing nothing there or at the very least feeling like she is missing something and, right or wrong, running away and entering nature is her answer to that.
Now the unrealistic... By analyzing her actions from episode two it's pretty clear she would have been dead by day four. That said I'm somewhat familiar with what to do in the woods and I don't believe I'm particularly the target audience. There are multiple more actions in subsequent episodes that definitely would have had her dead or in a very bad way all of which is ignoring the fantastical bits where she makes a forest friend, but like I said, maybe I'm not exactly the target audience.
Even though it for sure does not stand up on realism it has a good message and worth the watch, even if I wasn't particularly happy with the ending.