Aisha sounds like your mommy is about my age, i will be turning 40 soon. From a mothers point of view i can tell you that she would rather you didnt spend your money instead did something for or with her. now you can hand make some I.O.U coupons with things like monthly organizing her pantry, washing her car or something, or maybe doing something that she normally does and is her regular chore. you can make a 12 month coupon book this way and she'll have your gift for the whole year.
one of my boys gave me a pendent with all the kids birth stones which i constantly wear and an other named a star in my name, you can get the info online about that. i'll try to find the paper work for the one he used.
Do not give thing for the kitchen or to workout.* please* this is what comes to mind for now.
BTW
** Big HAPPY BIRTHDAY**
to your mommy from me.