all advise given before are just and logical. however as an abuse survivor and having gone thru the dilemma myself i would ike to add a point. i feel that in the reciever in such abusive situations are so sapped of self esteem and confidence to go on ,on their own that they assume it is more comfortable and resign themselves to these episodes of outburst. they feel that might not probably get 'better deal' than their partners. they always tend to keep milestones that they feel will bring them more stability to thier lives. like having a baby, then maybe if he gets that promotion he will be better behaved, maybe when his loans get paid he wil be less irritated, maybe if we behave extremely well he will see that and be more considerate, maybe he will love his child more than me and that is more important.all these are just thoughts that they run thru the mind to avoid the pain in front of them. but the situation hardly gets better instead usually gets only worse.
i would only ask you to advice her to read more about emotionally abusive people and what the warning signs are so she is aware. sometimes the awareness matters a lot when we feel trapped. all the best and god bless your helping heart!