My NY aunt died in S.C. in March 2013 and her will was kept in TN and has not been probated by the executor, a relative. Can we demand action?

My NY aunt died at 92yrs and had lived with her sister (89yrs) in SC for about ten years. She owns property in NY state where she lived with her husband, who died in 2001 and had a will drawn there.She and her SC sister would spend part of the summer in NY and return to SC where they lived together. (She stayed in TN for about 6 mos after her husband died and made her TN sister executor and her niece executor in case her TN sister could not carry out duties. The TN sister is now in an alzheimer's nursing home so that her daughter is now executor.) My SC aunt has asked for a copy of the will but has been refused by her TN niece who had also refused to have my NY aunt's social security and pension checks forwarded to SC. (The SS checks were finally sent a few year later but not the pension checks.) We don't know what company the checks were from.