The bow was something she learned as a Chevalier but not something she really uses aside from hunting animals. As for the Lyrium Addiction, it helps hone a Templar's skills, but it's not required. Alistair for example never needed it. It helps that her father was a Templar who used Lyrium, and he doesn't want his daughter to go through the same thing he did. While this does mean her Templar skills aren't as great as some, she makes up for with more conventional martial ability. Because aside from the anti-magical abilities, a Templar is still just a man in plate armor.