Later in the day when Agathe was done with the guests and had returned to her chamber, she made sure to ensure that no one would come around this path before going into the room. Aware of Marius' temper if she failed to deliver the price he solely demanded for, she decided to speak with him one more time and beseech for another request. She was still deterred in his explicable demand for her son's soul, but if she pleads some more, there's a chance he would take pity on her circumstances.
What has left her feeling extremely agitated was the announcement she heard last night. If by chance that girl becomes Queen, it doesn't matter who dies or not, but she will be officially stripped of her newfound reputation, and she would become an underling in the girl's eyes. She will have to bow her head for the new Queen, not as a symbol of respect, but for the girl to cut it off with her own two hands.