sixone
Lifer
I get the feeling she's going to ditch the car ("tracking device" and all) and borrow/use her friends' once they also get cars -- shouldn't be long since you all Americana in the country. Then you'll still know she's dodging you and jig's up.
Maybe the OP can rig something up and have Mom sew it into the lining of her coat or her purse. It doesn't have to work, just to fool her for a while. 😛