She might not have been much of a uker, but she could certainly write a tune.
The chords for this one are pretty straight forward, but it’s worth switching it up a bit with these inversions.
You can mimic the guitar by strumming down on the 2 and 4 beats. Or mimic the piano by strumming down on each beat. But I think this is the best way to go for a solo uke:
d u D U d u D U
You can play the piano part like this:
You can make it even more piano-like by picking rather than strumming (so all the notes sound at the same time).
When I was working up the chords I started playing this little arrangement of the tune.