Fours, in numerology, is the number of stability and balance. There are four points on the compass, four elements in the Western tradition, and four seasons. There are four sides in a square, and four legs on a table. There are also four aspects to the human being--physical, mental, emotional, and spiritual.
The Four of Swords signifies a time of rest and rejuvenation after a struggle or a period of intense mental activity.
In Robin Wood's deck, three of the four swords are sheathed, and one is carved into the stone of the sepulcher. The swords are put to rest as well. Now is not the time for the questioner to brain storm (the Swords are aligned with the mental realm) or sharpen his wits. Now is the time to take care of herself. From the position of the shield on the chest, now is a time for, at most, a defensive position. Do not take the offensive. Take a temporary peace to recharge before going back to the challenge or conflict at hand. Relish the relaxation, and feel gratitude.
Perhaps the questioner is more like the fellow up in the balcony, or the serving man carrying the tray of food, or the unarmed host. What does this vantage point offer? Can they influence the outcome of the situation?
She is in a cave, the symbol of the womb, and of regeneration. When she leaves her resting place, she will be stronger and better prepared for the problems that she may face. In that regard, the Four of Swords may be telling the questioner to not only take a break to rejuvenate, but to gather intelligence and possible defensive and offensive mechanisms.
When reversed, the Four of Swords mean that a truce or a time-out is denied, or that the period of rest and truce is coming to an end.