I went into the back room with her then refused help. She was not hostile at this point (was there a roll for this? I forgot) so I wandered around until I made it on top of the wall overlooking that room (she stayed in it.) Then I stealth cheesed the fight with only the ranger spider companion as distraction. She did call for help but since no one could figure out where I was, the only ones that came into the room were the ones that could heal her. Took them out first then finished her off, actually had to not hide for some turns to draw the rest into the room.
For this goblin camp you just have to find good vantage points. There are plenty of ladders, some of which you can destroy so no one can get to you. Everyone gets the Hide bonus action, this is very useful. For a full party you could maybe use a melee as the distraction but it can be done ranged only. There are also other environmental objects that can be used besides barrels and crates in certain areas.
