Dear brother, taking divorce is not taking revenge. In a womens case it's not even talaq it's khula. Allah has allowed a women to seek Khula in cases like this where a husband is abusing his wife. She in no way is seeking revenge, she is worried about her safety, she is clearly in a horrid situation and is merely seeking s mean to be treatec kindly with respecf. Clearly this is a desperate situation and it's one that requires drastic measures. Allah requires patients yes, and she has shown sabarain. Allah also says do not bring destruction by your own hand in this situation waiting around could cause her more harm than good. If a couple were having a dispute over minor things such a work, kids or housing then patients is a must. However if an individual see's no means of recogcilation then talaq/khula is a last resort. It's clear this sister has tried and been patient. For her own sake she must leave. Anything could get worse if she stays. Leopards don't change there spots, her husband is not going to change I doubt. She has been through enough I really want to help her. If I could Id take her to my house and advice her further etc