If she cannot substantiate her work time at home, you typically have the right to demand that she work at the office only. You are not required by law to permit her to work at home normally and may require her to be at the office if she does not intend to take a sick day.
I realize you have attempted to accommodate her other responsibilities, but it sounds as though she must be responsible to you as well and accommodate your needs.
You can inform her that she will be disciplined, either a verbal or written warning or even termination, if she does not abide by your policies as an employer.
If she continues to abuse your policies, she will be disciplined.
I hope that aids you in this situation.
Good luck and take care.
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