Legal advice

Around Christmas my Grandfather died and left everything to my Mother (his only biological daughter) and my Aunt (adopted daughter). Due to my Mom spending the last ten years at Keesler AFB in MS with my Dad, my Grandfather left my Aunt as executive of the will. She worked as a paralegal for twenty years so she is much more knowledgeable than my Mother. What rights does my mother have in regards to dealing with his estate? She's tried to contact her since after leaving from the funeral but has been told several times that it's not her place and my Aunt is handling everything because she has the "experience, time, and legal right". My Aunt is now married to a realtor and informed my Mom that she and her husband would be selling the house as well. Is it in my Mom's rights to know what's going on and do things like help clean out his house and etc. or at least have a say so in what is being done?