If both parties have signed the contract, you are probably stuck with this tenant. If you have not signed yet, you could just not move forward with the deal. In your shoes, I would notify her immediately if you decide to do that.
In the future, you may want to advertise locally for tenants. Accepting a tenant from outside the country may leave you with several months of unpaid rent and a lot of damage to clean up. Meanwhile, that tenant will have moved out of the country, leaving you with no recourse. A guarantee from her employer only helps if you have a contract with the employer.
The local company probably provides short term furnished housing for new employees and/or contractors. I would not do that either. You mention apartment - is this a coop or condo? The homeowners association probably prohibits short term rentals anyway.
If you used Craigslist to find a tenant, I would not do that in the future. I only got flakes and con artists from Craigslist. If you are not comfortable with or knowlegeable about being a landlord in your area, you might want to consider hiring a property manager. Yes, it will cost you some money, but it will relieve you of some of the headaches of being a landlord.