Yeah, I've been trading ammo and health kits, healing her and having her heal me, etc etc all the time saying thank you. Not sure really what else to do.
Also, I got the 'Lead Aspirin' achievement on the Execution Grounds (4-1, I think?). It's really simple. Once you start the level, stay up top and snipe one of the Manjini in the leg to draw their attention, they will come for you now. They will jump up to your level one at a time. Once you've got a feel for where their heads will be, take aim and pop some grapes...
Also, I got the 'Lead Aspirin' achievement on the Execution Grounds (4-1, I think?). It's really simple. Once you start the level, stay up top and snipe one of the Manjini in the leg to draw their attention, they will come for you now. They will jump up to your level one at a time. Once you've got a feel for where their heads will be, take aim and pop some grapes...