I would not like it, but if the potential employee had not been out of work for any extended period of time and her credit score showed poor money management skills, which can be a result of impulse buying or using poor judgment, then the credit score might be involved.
Employers do background checks all the time. Also, if the credit score was low and there were any bounced checks on her record, she would have no chance of getting a job where she might be handling money,
My sister once worked for a finance company a long, long time ago. One day her cash drawer came up empty. She had to stay after work, without overtime pay, the reconcile it. She was still a few dollars short, that she had to reimburse. She probably got distracted and lost count of the money she was handing out. People make mistakes, but when it comes to money, employers can be tough. She kept the job, worked there for more than a year and then moved on her own time table.