Jen walks around healing you when your in range.
Note: Her AI is that of a deer so she really tries hard to get away from you. Make her an doctors office and let her wander around inside.
When your survivor becomes a master at advanced engineering, you can now craft your own JenDroid! It requires a reasonable amount of materials and is geared towards mid to late game. She walks around your base and if your within 3 blocks of her she will increase your healing rate. She also can reduce the time for sprained or broken limbs by around 1/2. Nothing too over powerful but a fun little addition. Dayhawk plan on having droid versions of the other traders as he move forward.
Warning: JenDroid has desires to wander the world and see new things. Handle this as you will.
The forum topic of the mod is here.