Targeted by boss since she went to hr over not following light duty restrictions

Hi, my wife was diagnosed with cancer and had chemo , surgery and radiation. Her boss is a contractor for food service, and didn’t follow light duty restrictions so she went to hr. Ever since she did that her boss seems to be targeting her for disciplinary infractions.

She had told her in the office before she didn’t have confidence in her ability to do the job shes done for 10 years prior and only gave it to her because her other bosses liked her. She had to reapply because she was on a leave of absence then on standby. She was angry when my spouse told the other employers what she said.

She wrote her up for talking back to another Employee who was yelling at her yesterday and then “getting in her personal space”’ when the boss was in her face yelling in her office in front of her subordinate.

My question is should we obtain counsel or go back to hr with her concerns ?