I don't know if youngest is into sewing, but it's a great creative outlet if she's into cosplay or steampunk aesthetic. Such a big community she can join too! Would her sister help her and could it be something they create together? Her weird IS wonderful. At Halloween our work had a small distanced costume event where I dressed as a sort of goth circus leader (work is currently a $&!7-show so I declared myself leader of the circus :-D). I wore a coat I sewed many years ago and wear nearly every Halloween. Simplicity Pattern 2172 if you look it up - it's just the underbust floor length coat but I made it in black. It's kinda cool.
I do have some distractions of work - I still go in to work once or twice a week, and I do see some students and coworkers there though very briefly. But yes, it's different. I'm doing a lot of cooking, trying to still hike/walk for many miles to clear my head and loosen my legs from being sedentary, and classes started back up again on Monday. Plus I got back into sewing myself, so I have some projects going. But I know what you mean - I can't decide if I'm thriving or missing out on life.
I always imaging you're so incredibly busy. Full time work, full time mom, managing change, staying social, staying fit. But do you think you'd have capacity for an online course of any kind? Would you ever? I imagine this is an especially difficult part of the pandemic for most everyone. Anything new that you're enjoying just for yourself and your own interess?