The Valkyries are usually shown in service to Odin, but others have interpreted them as being followers of Freya.
In God of War, Freya's spell drove Baldur to madness and filled him with dangerous rage, as evidenced by his encounters with Kratos, and made him dedicated to loathing his mother in order to cause her pain.
The first thing that Thor says to Freyja is that she should dress herself and put on a bride's , for they shall drive to Jötunheimr.