What did you stop doing preventing it?
I think you're asking what changed to reduce the incidence.
For one thing- don't do U-turns in 2nd gear. If you get too slow with the clutch engaged, she'll stall and drop like a rock.
Don't park on surfaces that leave the bike near-vertical. It only takes a negative thought by the bike and she'll fall to the downhill side which is the worst possible scenario, because mirrors get smashed.
That's two. You can find more for yourself, as you've already begun doing. To stop that one happening again, make yourself a plywood puck to carry in the pie-warmer to put under the side stand. There's a photo of one in the forum with a string to tie to the handlebar so you can pull it up without bending down and having the bike fall on you leg (another bag look).