well depending on what kind of music your mom likes, www.dishant.com , www.sma****s.com , and www.raaga.com are frequent music sites i visit, the have from modern music to classics.
ppl in that age group like soft music, good lyrics.
Most of the people are fans of Lata, Rafi, Mukesh, Noor Jehan.
From Pakistani singers, try to get some CDs of Farida Khanum , Tina Sani, Ghazals of Mehdi hasan.
Also the Ghazals of Jagjit and Chitra would be a good choice
kawan kawan kawan tay aj mera jee kerda
main ud jan nal hawawan tay aj mera jee kerda,
rabba rabba meen barsa sadi kothi danay paa,
muhay start nahin aa raha ABRAR UL HAQ ka hai
perdaisi hoyon ray dil cheer gion ray.........
jidoon apnay dais da jaaz utoon di nagda ay
tay yadan da ik nag dilan noon dangda ay....