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Short answer, in front of everyone at the ceremony.
A little more detailed answer:
At Pennys coming of age ceremony, there’s a part where she and her family members are supposed to toast to celebrate her. Derek comes in late and brings Yvonne(who was banned from coming by the father). I think the dad didn’t want to make a scene so he let her join since she was already there. Penny noticed that Yvonne’s cup had poison and realized that Yvonne was going to poison herself and make it look like Penny poisoned her. So penny ended up grabbing Yvonne’s cup and drinking it in front of everyone during the ceremony and immediately spits out blood and passes out.
Honorary mentions:
Calisto was there
Bunny dude was also there(the magician)
Bunny dude gave penny a necklace a long time ago that lets her know when she’s in danger. She happened to wear it during her ceremony. Both penny and the bunny dude saw her necklace react and therefore knew that her drink was poisoned. Bunny dude knows that penny knowingly drank the poisoned drink but he didn’t know why. He also just happened to have the antidote to the poison that penny drank.
Calisto was the first to react when Penny drank the poison. He also was mad at everyone for reacting too slow. He also brought penny to his mansion to recover and told everyone that he and penny were engaged (≧∀≦)
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I believe he thought that penny was planning to poison Yvonne somehow but was surprised that she herself drank the poison. He didn’t know that it was Yvonne that had the maid bring out the poisoned drink.
I read the novel a while back so I don’t have a link but it shouldn’t hard to find, just go on google and type in the manga title and put novel,
I.e.
Death is the only ending for the villainess novel
Getting ready for the waterworks. Wondering if i have the patience to let like 5 chapters come out so I can read them all at once lol I’m hoping that what happens next doesn’t get split up into 10+ chapters I.e. penny drinking poison, passing out, staying at the palace with Callisto.
Sorry not sorry if you had a problem with my spoiler, I put the spoiler warning for a reason ╮( ̄▽ ̄)╭