I’ve had good experience with ToDoist. Downside is it’s a paid subscription

[lone geode]

But you might be able to use a paid service b for yourself and a free one for her

[sharp prism]

I tried that one a few years ago, and I had two major complaints. let me check and see if they've fixed either of them

ok, it looks like the 'weekly review of completed tasks' is still not a thing they make easy, and it's still best for tasks with deadlines instead of open ended projects