Do senior students have same chance at rushing?

My 72 year old mother will be coming to TCU in the fall to get a undergrad degree in communications. I was just wondering if the sororities are welcoming to older students as they are to the younger students, specifically Delta gamma. My mom loves instagram and has been looking at all the sorority instagrams here. Her favorite is Delta Gamma and she really wants to rush. I don’t know much about how greek life works with senior students so if anyone has any information on this that would be wonderful!