Kids book, 80s-90s, a group of kids on a spaceship, something to do with butterflies that accidentally get killed by the youngest girl. I think the cover was dark & either had butterflies or the spaceship on it or both.
Stump the Bookseller
New format, same book stumper solving.
Calling B for Butterfly by Louise Lawrence
Might be Calling B for Butterfly. This was a query and answer on another web-site. https://www.goodreads.com/topic/show/1749702-solved-young-adult-space-travel-ship-has-disaster-mostly-only-childre
Yes! That’s it! Thank you so much!