A get-well card is read as care sent from a distance. Tradition sees it as the wish to be remembered while you struggle, or the urge to reach out to someone going through a hard time.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.