Hi. I have an employee who is on Husbands visa and...

Related to your inquiry, if there is an employee on the sponsorship of her husband associated with your company with a limited employment contract, here are the following information:
The UAE Labor Law stipulates that the employer shall bear the value of the return ticket to the worker to his country, if the worker want to return to his country after the end of the employment contract.
If the worker want to move to the employer nor leave the country, the employer is not obliged to provide the airline ticket.
Here is the text of the UAE Labor Law regarding your inquiry
Article (131):
Upon expiry of the contract, the employer shall bear the cost of the worker’s repatriation to his point of hire or to any other point that was mutually agreed upon. Where a worker joins another employer upon expiry of his contract, the latter shall bear the cost of the worker's repatriation at the end of his service.
Without prejudice to the foregoing, if the employer fails to return the worker or to pay his repatriation expenses, the competent authorities shall do so at the employer's expense and may then recover any expenditure incurred in this connection by attachment. Where the reason for the termination of the contract is attributable to the worker, his repatriation shall be at his own expense if he has the means to pay.