My knowledge of Mycology is limited, so I may be wrong...
She rejects the Fly Agaric mushroom, which would get her high, but because of her inability to refuse, is about to eat what looks like a Panther Cap, which will kill her.
The rabbit princess gives in to peer pressure to a snail and mushroom about eating one of them, now that's a sentence I never thought I would be writing. (Page 6 and 8)