Hello there! My name is Sara. I went to a family gathering this past Saturday and learned that another one my mother's cousins has been diagnosed with ALS. Every so often I'll Google Bly's with ALS to see if it comes up with anything new. That's how I stumbled on your reply from almost a year ago!
I have something that someone sent me while with Ancestry (6 years ago) that traces your Alesha Bly back to David Bly (1780) and Hannah (no surname given). I don't know if you've come across this yet or not but that's about the only information I've got and I'm unable to trace it to my Bly's. The furthest I can go back is my great great grandparents, Thomas Wallace Bly (1878) and Katherine (Jukes?) (1886)and even some of that info is sketchy.
Very sorry to hear about you and your family's loss. ALS SUCKS!