I didn't want to Frankenstein together a bike for my wife, so I got one online and put it together this afternoon. I learned a few things.
1) The bike is too big for her at 57cm(she is 5'9"), but it is fine for me.
2) Presta valves are a thing.
3) Hauling a child comfortably will require more gears.
4) This is a pretty good single speed. I was pleasantly surprised that it was geared fairly high.
5) It was not relaxing or very comfortable to ride, though 5 miles in 20 mins was nice.
6) This bike is quiet.
7) I missed riding a bike. It was fun!
I'm not sure if it's worth taking apart and returning. I would probably have to pay some kind of fee. Bummed that it didn't work out for her though. I had planned to do something cheaper for myself, but now I don't know.