A (soon) 16 years old should already start to get the hint. Especially witnessing Leonard's personality with her own eyes, it's pretty strange she just keeps pushing forward as if she heard or saw nothing. But then again, maybe Liz has a screwed up history of her own. I don't actually remember if such was mentioned. Not realising the consequences of what she was saying to Jill was realistic, though.
Let's hope Jill didn't run so far off she bumps into the villains on her own.