Eh, I wouldn’t agonize over what she did or didn’t do. You appear to have reacted appropriately and proportionately, so I’d just be glad you don’t have to deal with her anymore. You cannot read the future, nor others’ minds, so as long as you don’t behave in a nasty or overbearing manner–and it sounds as if you did not–then you ought not worry about what you might or might not have caused. It’s certainly a good reminder to us that people may be affected by dire circumstances in our lives, but your daughter should have a good experience in school, too; she’s too little to bear the brunt of adult problems.