I can get her to pick up things for carrying if I drop them from my inventory first. I've also noted now if I have her retrieve her standard loadout from a dresser I have for her in my armory at Lakeside manor they become marked as stolen if I take them from her later. If I drop them, have her pick them up from the floor then take them from her in the trade items dialogue they are returned to their original status.
Wondering if anyone else has experienced this glitch with any other characters/followers or have a fix. I deal with the work around of dropping things and having her pick them up, but it's extremely inconvenient in hostile environments and really limits her usefulness in those situations.