How do I get Aethelfaed?

Complete expeditions. The more levels you complete and the more you three star the more coins you get. 1 Aethelfaed sculpture costs 1,500 coins.

Any level you do not three star will need to be completed daily to get the rewards. Once you've collected the rewards there is a cart in the top left. Select that and her sculpture will be on the top row. You can only purchase 3 a day.

You can also complete the attack/defend expeditions that reward a chest. You have a chance to get more of her sculptures in those chest.