Filing case for maintenance against husband in the UAE

Dear,

I am writing this on behalf of my sister in law:

"I married this guy almost 15 years ago. He left for a job in the UAE. Now he rarely visits me in Pakistan in years. He also got married to some other Pakistani girl in the UAE.

Meanwhile, he is forcing me to live in Pakistan in his own home and does not directly give me the money to take care of myself and my children. He sends the amount to his father and he then assesses my needs and gives me a calculated amount.

Is there any law in the UAE through which I can bind him to pay me my expenses or I can take khulaa (separation)?"

P.S. The lady is really heartbroken and desperate. Please respond asap, I shall be very thankful.