My Three Month Old Suddenly Won’t Nurse, Help Please!?

I’ve been exclusively breastfeeding my three month old since birth, she’s been a great eater up until yesterday. I don’t know what’s causing it! Every time I put her to breast she gets really mad and cries. She eats for five minutes at most. I gave her three bottles of expressed milk just so she doesn’t starve and she ate it just fine. What could be causing her sudden dislike for nursing?
She doesn’t have a fever, and I haven’t changed my diet at all.

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