Employer Told Wife Doctor's Note Is No Longer Valid Mid Shift And Is Forcing Her Off Light Duty

Wife had an injury to her wrist about 2 months ago, took a couple weeks to get into doctor and she recently had an MRI done showing a fracture as well as the start of carpal tunnel. Wife had been issued and wears a brace at the moment to accommodate. Ever since she went back to work with a doctors note about a month ago she is constantly harassed regarding light duty by both manager and other employees, a few hours ago she was told midway through her shift she needs to do heavy lifting and her doctor note is no longer valid she needs a new one. She works at a gas station and the only limitation she cannot do is lifting 30+lb trash bags and stocking heavier cases of things in cooler. Need advice on legality of this.
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