your fiancé sounds quite unstable and violent with trying to choke you, slashing an ex's tires, threatening others and hitting the dog. you don't even know what the "episode" is her father is referring to.

i would consider yourself lucky she doesn't want to be with you anymore. i'd stay as far away from her as possible and i'd get some help regarding why you'd be with such an abusive person. you have been ignoring multiple red flags for awhile now about this woman. cut your losses, get help and run far from her.