Initially her theme was yellow, as usual. After two save/loads she became green, including the minimap. dlc1_campaign_level2_name_20160718184407 dlc1_campaign_level2_name_20160718184407.meta
Can you upload the save, it all sounds rather odd so maybe the file will hold some clues.
Confirming replication steps. I found that this seems to occur no matter what level is selected but I only tested with Heart of Gold Level 1 & 2.
Replication Steps:
1. Start a Heart of Gold Level
2. Save the Game
3. Load the Game
4. Save the Game
5. Load the Game
6. Look at your man
7. Now back to me
8. You are now green
Also when you then exit to the main menu you will be on the original campaign map, not the Heart of Gold one.
Theory: Perhaps loading a saved game sets a value to the Original campaign, saving it again overrides the settings of the map and makes it think it's part of the original campaign?
Did you possibly play an Oberon level just before loading the save?