The only thing you could have done better was warning that bitch with a loud voice so everyone could hear that she instigated first. Other than that she was totally deserve it.

If I were your brother, I'd give you a head pat for standing up for yourself. Violence may not be often the correct answer but it's always an option.

I don't think so, if I remember correctly only the orbital distance and eccentricity affects tidal friction. Synchronous orbit aka tidal locking doesn't change anything mentioned above.

In theory, yes. We have discovered from binary asteroids to binary stars so binary planets are physically possible. However; if the separation between them is too close tidal friction could become an issue, making them lose momentum over time resulting collision between the two.