Hi, S.,
We have a young boy (neutered male) named Zamm we adopted from the shelter. He was about 6 months old when we brought him home. He's about 2½ years old now. He was a really, really frisky little fellow at night, too, but he eventually got into the culture of the house. We have an older girl, and she is very sedate at night, so that helped Zammy get into the routine, I think.
I'm guessing no one's home during the day to stimulate Lucy, right? Does she have window perches she can look out of during the day? Does she have a climbing tree in the house (one of those carpeted kitty condos). She might be able to get a bit more exercise on her own during the day (or not, I don't know).
One thing you might consider is (ulp) adopting a buddy for her, maybe a slightly older cat. That kitty (it'd have to be somebody you're sure would get along with a younger kitty) might take the heat off you at night and might give Lucy someone to expend her frisky energy with.
I hope that helps!
I think eventually Lucy will come to realize that nights are for sleeping in your house