Is this employee a victim of retaliation, an FMLA violation … or both?

Q: “A friend of mine was out on FMLA that turned into short term-disability. She kept in contact with her employer, letting them know what was going on. A month before her return she asked if she would still have a job and the email back said yes. The day she went back to work, they released her and said that it was due to restructuring. The girl who replaced her is still doing her job, and my friend has proof (which she had previously showed HR) that this girl is a racist, and they swept it under the rug. We think she was let go because she brought that to their attention. Does she have any recourse against the company?” – Robin, Missouri