Fraud of poperty

Hello Sir/madam, This is an issue regarding the power of attorney. My mother purchased a plot with the help of her brother and she registered the plot in the name of my maternal grandmother. She was guided by her brother who helped her get the property but she paid all the money and shes been living in that house since 2012. She had made a power of attorney from my grandmother of the plot and meanwhile, her brother also got a power of attorney in his name by my grandmother. so, my grandmother issued two power of attorney, one in name of my mom and other in name of my maternal uncle. So, my maternal uncle got the plot registered in his name by using that power of attorney. my mother is still residing in that house but she has no proof other than that power of attorney. Plus, there is a case going on that plot by my maternal uncles wife, who's seeking divorce from him so shes filed a case that she wants a part of that plot because that plot has been registered in the name of her husband ie my maternal uncle. so, what remedy does my mother have?