Also, I have an issue with this situation. I have an option to get permanent +1 to any stat but it seems that i doesn't do anything. The stats aren't changing even after rest.
Did you use the item that gets placed into your inventory?
The reward menu after defeating her encounter allows you to select which stat you want, an item is then created (Auntie Ethel's Hair) and placed into your inventory after selection.
You need to consume the item within your inventory to receive the stat increase.