Jealousy can make people turn to evil beings. It could also bring out true nature of people. Miriam was not happy with the ways things were going for her. She had been groomed for years to be queen in the future but someone else emerged out of thin air to take her place. This did not seat well with her. Since Jeff brought in another woman to be his princess, she was going to do everything possible to discredit Evelyn to be chased out of the palace. To do this Miriam hired a group of trained men to get more detailed valuable information against Evelyn that she could used before the committee and the elders.
There was nothing Jeff could do if the elders and the committee reject his wife. He will have to divorce her even if the rules does not allow it. He married Evelyn Smith without their consent and they could revoke the marriage if they saw fit.
The men went out and within a short period of days, they had already gathered as much information about her as they could.