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 Baxter died in 1902.
Lucy Markham died in 1960.
Lucy Anderson died in 1878.
Lucy Dawidowicz died in 1990.
Lucy Wright died in 1821.
Lucy Mansel died in 1916.
Lucy Wheelock died in 1946.
Lucy Osburn died in 1891.
Lucy Terry died in 1821.
Lucy Hastings died in 1679.