Why does lady Capulet try to take revenge on romeo?

Someone answered, "Tybalt wanted to get his revenge on Romeo for falling in love with Juliet because he hated Romeo's family, the Montagues."But that is wrong. Tybalt had no idea that Romeo was in love with Juliet. He thought that Romeo was insulting the Capulet family honour in some way by crashing their party. He was going to get revenge for this by killing Romeo. Did this make sense? No, but Tybalt would use any excuse for a fight.