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.
Nephthys was the sister of Isis, so if either of the other cards in this reading is Isis, it’s likely that there is some kind of soul connection apparent in this relationship. And as Nephthys was the protector of the Canopic Jars used in mummification, it’s likely that you have a strong sense of responsibility. She was also married to Set, who represents the energy of evil and chaos in the Cartouche. Probably this is why she took a lot of action in secret.
It’s possible that you find yourself feeling very nervous about life in general and wish that you could control the outcome of everything in the hope that it’d make you feel more secure. This may give you a certain feeling of being on edge.