Yes, the path was clear. The little dwarf just dodged 9 attacks in a row. I am a veteran of the series and these types of RPG's as well. I can assure you that I was fully aware of the effects modifying Sebille's accuracy and I had clear LOS on the enemy with no obstructions.
The bow I was using was level 3, I was level 2. A -20% accuracy alone cannot explain what happened. There is also the fact that I continued to miss very frequently in other fights until I hit level 3. I'm not sure if this is a bug or just that the displayed chance to hit was not accounting for dodge chance.