Besides a g banger i would choose somthing productivly uselfull and an item she will never leave home without.
Option 1
1)A garden gnome I give them to everyone
If there was anthing id want in the world it be THE garden gnome.
give them to your kids give them to adolecents infact a garden gnome is the worlds most favoured gift.
Last year i gave mum a garden nome doing cooking.
The year before that i gave mum a garden nome doing washing.
Even a big hit as a wedding gift
Icouldnt think of a more useful present can you.
You can even get her grandkids to paint it.
option 2
2)big mouth billy bass fish there allso so verstile and usefull i wouldnt leave home without one.