Redshift Community

I joined the Theive’s Guild and walked into (presumably) the rich family’s house. After stealing all the loot downstairs, I decided to go upstairs. I ran into “Kierrea, the council member’s wife.” Naturally, like a good sneaky thief, I talked to her. She promised to alert the guards; which was distressing, because our talk was going so well. I made her into plant food (her choice, really).

My questions: Does anyone know what the consequences of killing her are?
What does the key she drops unlock?

Consequence: just the usual for killing someone.
Key: continue upstairs.