This page of our guide to Greedfall contains a detailed description of a Find Queen Bladnid companion quest commissioned by Siora.
Where to start the quest?: Complete the Battle of the Red Spears story quest, then talk to Siora and agree to help her.
After the conversation, go to the location of Vedrad "The Red Woods" and talk to the Captain of the Outpost. You will find out that Siora's mother is dead - go together to the resting place of her body. Let Siora pay respects to her mother and then talk to the woman. Go to the captain and try to convince him with the help of charisma to give you access to the body. If you don't succeed, you'll have to force him to do it another way.
Go into the outpost officer's quarters and pick up the letter. Then look for the key to the chest, or use the lockpicking skill to break into it and get further incriminating evidence. Move to the designated meeting point, hide behind the rocks (crouch) and watch the cutscene.
You'll have to defeat the smugglers and talk to the captain. You can now use the option to automatically return to the village of Vedrhais - do it. Talk to Eseld and tell her everything. You will finish the side quest. You will get + 3 reputation in the relationship with Siora and 1000 XP.