Your luggage problems are why we got Air Tags. I follow our bags along every step of our trip. If they get lost, the bag information the airline has can often be wrong. You show them where they are on your Find My App and voila!
Also, AA sends you text messages that show the progress of your bags. Your sister probably didn't get that service since she started with AK Air, but the texts are really helpful. Between that and the Air Tags, the chance of problems are minimized.