Hi Keith, first, I would suggest removing your email. This site is a top google search result so your email is exposed to the world, literally.
About the phone, have both phones downloaded the same software updates? I know since its on Straight Talk, and not AT&T, its no longer possible to download software updates, but check settings --> About Phone, and see if all the software version, baseband, etc are all the same.
You can put her phone in recovery mode, and clear cache.
Follow the instructions here.
https://www.androidpit.com/how-to-clear-the-cache-on-the-samsung-galaxy-note-3