My wife, as a manager (now retired) wasn't squeamish about firing anyone, regardless of race. She documented everything, and worked closely with HR and legal departments. One Chinese guy tried the race card, claiming discrimination, getting sympathy from others and hoping to beat the system. My wife persevered, and when the legal people interviewed her in person and saw her face sided with her. She has my jewish name. But she is Chinese-American. City cops took him out in handcuffs after the Chinese guy lost it and went ballistic on company security. He sued, and lost his case. Tell your daughters to hang in there. Document everything.
They depend on HR and the write up reports. It just takes awhile to learn all that and get tough.
Thanks, others can learn from all this.