Just don't fight goblins at all is probably your best option to free the druid.
Example let's say your character is a warlock with 16 charisma... Will can step in if needed,
Spoilers
Step 1, at the village where the gnome is tied to a wind mill talk the ogers into fighting for you instead... Offer them money or loot the dead, (kill the goblins or just ignore them
Step two summon your imp ( turn him invisible) and send him off to discover the summoning stone in the golblin camp... Teleport to that stone bypassing the guards
Step 3, go upstairs where the drinks are sleeping it off and the wall is cracked, blast it with force magic i.e, your cantrip to open the way into the goblin stronghold... Once inside you are up in the roof above every one, explore to find the drow cleric getting ready to attack druids
Step four, talk to her and tell her where the druid camp is, Agee to help rape / kill druids and she sets off to get ready
At this point you can leave goblins area and never need to return... It's nice loot but not needed to move the story along
Optional go down the well back in the windmill village to kill spider Queen (orgers can help if you want) and cast feather fall to drop down to the underdark... Invisible characters work best down there to unlock summoning stones but that's another thread
Step 5, return to druid grove and drop a few barrels of oil/ explosives around the front gate .. it's the same area you fight the golbins when you first arrived at the druid grove
Step 6 talk to Zeb tell the drow are coming but agree to help, rest and she shows up saying open the gate to begin the battle... Pick which side you want to fight but I'll assume saving druids... She will stay on the hill sending troops at the gate, blow them up then kill her last or push her into a trap , once this battle is won the druid boss auto shows up saying he got himself out
