The Cups are water, which represents feelings and emotions. The Priestess of Cups means what I said in the interpretive article if you read it.
She is strongly emotional and caring, expressive and understanding. The only one stronger than her in the Motherpeace deck would be the Shaman of Cups. If you get this card in a tarot reading, either you or someone close (you must decide who) is feeling good about herself/himself, in control, and happy about the good outcome that should come about.
She shows us an emotional best, or at a happy and festive time around friends and family. In the Rider Waite Smith tarot deck, the standard, she is the Knight of Cups, a bit less in stature than the Queen or King. So she has room to grow emotionally, and she will.
The Motherpeace deck is feeling and woman-centered, much different from other tarot decks. This is why I chose to highlight it. The deck was created in the 1970s at the height of the first Women's movement.
When reading is done with most Tarot decks, the cards are either Upright or Reversed. The Reversed card means the energies are there, but the person isn't quite feeling them yet. With Motherpeace, the cards come up at different points of the circle, so it leads up to a feeling more slowly and moves away from them more slowly.