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Hi. My name is***** I'm sorry to hear about this situation with your little one. Butter itself isn't a toxic situation, but it is very, very rich and it can cause some significant stomach upset, diarrhea or for some pancreatitis. If she just ate these two sticks, probably the easiest thing to do is to make her vomit to bring them up and hopefully keep any further issues from happening.
Here is a good link on inducing vomiting in a dog.