I see 4.3 is out, and it looks like there's a release of 4.4 as well. However, I notice that the OTA 4.3 locks the bootloader.
I haven't done that yet, obviously, but her GPS is acting up so it's time to get her up to date.
What's the upgrade path from 4.1.2? And what's the cleanest (CleanROM-esque) slim TW ROM these days (4.3 is fine)? She doesn't want fancy features, just quick stock without a bunch of crap.