Thanks all for the empathy/advice/perspectives

I subverted today’s thing by a) when she first asked to come along I said “ maybe—depends on what I end up doing” and then b) going for a bike ride around the neighborhood (she can’t ride a bike, and only really wanted to come along if I was going in a proper adventure like driving to a lake or something). Next time she asks I won’t be caught off guard and will have some kind of “I’d rather be alone” phrase prepared. (Because this kind of situation is so steeped in my maternal muck, I’m not very fast on my feet... but if I’ve thought through ahead of time I can usually come up with an appropriate thing to say.)