As well she should be. Looks like she has slurped down a great many three flavor slushies in the past.
Lots and lots of them.
Why should McDonalds cut her off now? Besides, it's racist.
What we see here is why it is dangerous to interact with a ghettopotmus in the wild. She has become enraged, because these humans have come between her and one of her favorite food sources.
Now that was a McFlurry!