From what I’m seeing from a google search, this seems to be a plant with berries, right? If it is the same plant, one of the websites I saw said that it causes stomach upset when eaten in large amounts but is not harmful in small amounts. Definitely keep an eye on your little girl, but it sounds like she should be fine. Also keep in mind that “toxic” doesn’t necessarily mean that it will kill an animal, like how chocolate is “toxic” to dogs but eating it will not them, just affect their blood long term. Rabbits also have very different systems than rats but the plants that are poisonous to them may not harm rats at all. This is just my opinion of course, hopefully someone else will have more experience with this plant. I hope your girl keeps doing well!