My feelings change slightly because this is a friend of a friend. The OP owes this woman nothing and has no incentive to maintain the relationship.
That being said, I don't see how this one message was so terrible. Just going on the message that was posted, I don't see anything hostile or aggressive. Were there a series of message before this that led you to defriend this woman? (I will say, though, I do think it's odd to send that kind of message to someone you don't actually know.)