Can employer stop paying holidays after having paid them for a year?

Question Details: I work part-time at 2 dental offices. My bosses agreed to split my holiday pay and each gave me 4 hours. However, 1 boss retired but new boss agreed to pay me the 4 hours for the holidays and did so for a year. Now, out of nowhere, she yanked all my holiday pay from me. Is this legal? From what I've read, it was an established policy since she had paid my holidays for a year, therefore they can't take them away.

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