* Overconfidence and Underestimation of Others: Foxface is incredibly cunning and resourceful, but she becomes overconfident in her abilities. She underestimates the other tributes, including Katniss, who ultimately proves to be a much more formidable opponent.
* Lack of Allies: Foxface operates primarily as a lone wolf, choosing to rely on her own skills rather than forming alliances. This leaves her vulnerable, as she has no one to watch her back or help her when she's in trouble.
* Hunger and Exhaustion: The Hunger Games are a brutal and unforgiving competition. The lack of food, constant threat, and exertion eventually wear down even the most capable tributes. It's likely that Foxface's strength waned due to the hardships of the Games.
* Miscalculation: Foxface's fatal mistake seems to be her reliance on a potentially poisoned berry. Although she may have intended to use it as a weapon, she misjudged the effects and accidentally consumed a deadly dose.
It's important to note that Suzanne Collins never explicitly states how Foxface dies in the books. The readers are left to assume what happened based on the clues presented, making her demise even more mysterious and tragic.