I do not understand. Are they sure these were javelinas? Javelinas are so small, the only thing they could attack is her ankles.
At 3 to 4 feet tall and over 75 lbs, they can certainly do damage above the ankle, and a little dog is no match.
I've seen the scars on a human (a former boss of mine) from a javelina attack. It was just below his knee.
It was a serious injury.