Gittin 64: Old Enough for a Get

Two mishnayot: 1. A woman who appoints a shaliach to accept her get for her needs two sets of witnesses to ensure the divorce goes through. Likewise, when are the main parties in a transaction believed over a third (objective) party, and when the reverse? 2. The case of the na'arah hame'orsah - a minor girl who is betrothed and needs a get to be free of the betrothed. Her father needs to accept the get. Plus, a minor girl who can safeguard her get can get divorced.