MIL is very frail but sharp as a tack - she's also banned me so DH and DCs will be going to see her. They must not go empty handed. It's not my job (though I'll be paying for presents and fuel) but looking for ideas.
1928 Silver Sixpence on a chain - lovely but implications of time.
Garden Gnome (she can just about make it to her garden) has a spade in its hand!
Flowers, candles - Catholic symbolism.
No alcohol - medication. Food would be a waste.
A tree or plant - it's touch and go. Mainly go with every plant I touch. If I had a rock garden the rocks would die.