Yes, in the final book, she was killed in a train wreck.
Yes, Lucy really did die. Lucy was a baby of a young couple that got pregnant by mistake, and they had abortion, killing Lucy. John Cooper is talking about an abortion in the song Lucy.
If you want me to spoil it for you... Then yes. She does die. But it's really complicated. Watch it, it's interesting. I read that the movie was sort of expected, but not exactly, the end really surprised me.
Lucy Harris died in 1836.
Charles Lucy died in 1873.
Lucy Washington died in 1846.
Lucy Larcom died in 1893.
William Lucy died in 1677.
Lucy Burman died in 2004.
Lucy Hutchinson died in 1681.
Lucy Bacon died in 1932.
Lucy Baxter died in 1902.
Lucy Morton died in 1980.