Choose one thing a day, at an agreed time. Fresh air and exercise after being stuck inside because of the weather. Cycling, walking by the local canal on fine days. We cycle on the local common to avoid traffic.
For wet/cold days...plan a bedroom makeover - get paint charts and ask her to decide on a theme - spring flowers, fairground, seaside, underwater etc. Get her to research designs and products.
Gardening project. Choose an area to make over, or just some new pots and research bulbs & flowers, when they flower, colours etc. Or plan some veggie plants. 6 pots - maybe 3 with tomato plants, 1 with a chilli plant, two with french beans. when to plant, what they need.
Or one toy a day, and join in with her.
Teach her a new card game - crib or whist.
Choose an easy recipe and help her to make a cake.