Thanks, Fletch! I hope you put the book to good use. Writing, publishing, and promoting it has been quite the learning experience for me.
Back on topic... It sounds like Ellen needs to invest in some real crampons. I bought a pair of KTS running-shoe crampons when I was in SoCal, and they were great for icy conditions on Baldy, San Gorgonio, etc. They're still one of my favorite pieces of gear, light and useful on pretty much any snow or ice where you don't need front points.
As far as screwups/"learning experiences", my biggest to date was definitely on
Mount Robson in 2014. Coming from the North Cascades, I had been fairly aggressive in climbing despite bad weather; otherwise you spend a lot of days sitting around the library in Concrete. Despite a so-so forecast, I decided to go for it, and it was merely overcast until I got to the last few hundred feet of moderate ice on the south-side route. The summit was in the clouds, and I made the mistake of continuing up, figuring I could follow my tracks on the way back down. I ended up summiting inside a ping-pong ball, then spending a couple hours off-route downclimbing through a crevasse maze on the summit glacier. I made it down unharmed with no close calls, but I was lucky.
I still don't carry a SPOT, but now I always have a GPS with me when the weather might be less than ideal. I don't use it very often, but it's invaluable when I can't see and need to retrace my route or orient myself.