It could be triggered by dust... So both times she had just been at your folks' house?
that that's what it's all about and it won't recur!
"We are--each of us--dying; it's how we live in the meantime that makes the difference."
"It's not what you gather, but what you scatter that tells what kind of life you have lived!"
"Be kinder than necessary, for everyone you meet is fighting some kind of battle."