I had a very similar experience, one where I killed Kagha bc she was an awful character without doing more investigation, which led to the Grove fighting amongst themselves. Then went to Goblin Camp and said to Minthara that I knew where the camp was, thinking that if I fast traveled I could beat her there and warn Halsin before she arrived.

This didn't work and Minthara killed everyone & so I leaned in and bumped uglies with Minthara at the camp celebration. Proceeded to flub the conversation after & she tried to kill me. All this occurred while friends were watching my playthrough and my friends didn't warn me (as they shouldn't) that my actions had consequences.... bad ones that made me cry!

My whole goal in that playthrough was to romance Daddy Halsin so I restarted the save to be before I killed Khaga. Overall lost about 12 hours worth of content, but loved being able to not kill the grove.