It sounds to me like over the five years since she started the job, her butt got a whole lot wider and she developed cankles so she decided to use religion as an excuse to modify the dress code to hide her fat butt and chubby calves.
Without her employers side of the story, you can't determine if she had been informally told previously that her modification was unacceptable or if there are valid reasons for the standard length of skirt.
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