What are my mother's right if my she wants to sell the property if it is under my sisters name?

I have a question concerning property law in Los Angeles County. Back in 2003, my mother had purchased a commercial property under my older sister's name to avoid property taxes, as she has another property under her name. The property is bought solely under my sister's name; my mother does not co-own it. However, my mother alone paid the down payment and the loan. The property is now loan free and rented out, and my mother pays for the income tax until this year. This year my sister had reported the income of 2012 as hers. Question is that what are my mother's right if my she wants to sell the property? And does my sister's husband has any say in this. Additional info: My sister had a foreigner status when the house was bought, then she over stayed on a student visa. She is now married under 1 year, and is in the process of applying for a marriage green card. Thanks for your insight!