Nephthys is a spiritual or psychic woman, who talks about what is hidden and tells us about things that have yet to take place. She’s sensitive to her environment and is able to feel things that have yet to be revealed to the world in general. Having her here indicates that you are on a quest for substantial self-discovery. This could possibly lead to you presenting in a very different way to the outside world – because of the evolution in your soul during this time.
Nephthys was the sister of Isis and was the protector of the Canopic Jars used in mummification, so it’s likely that you have a strong sense of responsibility – something that you need to feel in order to feel secure.
Nephthys was married to Set, who represents the energy of evil and chaos in the Cartouche. So she took action in secret when she helped Isis. This may be something that resonates with you.