It isn;t always easy to leave someone as controlling as her husband, as i know for sure
My daughter was married to a very controlling man he watched her every move, she even had to work with him, she once rang me in tears when he had slipped out to his brothers next door, she was terrified of him, i told her to ring 999 and leave the phone off the hook in case he came back if she didnt have time to speak to the police, as i had read that the police would trace the call,they did and brought her to me, [landline]
He used to keep a knife above the bed ,and had several guns, i often saw her with bruises but he was always with her and made excuses, most were in places you couldn;t see, but she had some behind her ear,but had to say she had banged her head on something
After she came to me he rang several times and threatened to shoot both of us,
He was eventually put in prison, and she was allowed back to her home ,with panic buttons, and when he was due out she came back here
The bad thing about that was he was mainly charged for firearms offences, not much for what he did to her
Anyway in the end he hanged himself, best thing he could have done, but she had a breakdown and was ill for quite a long time
She has now got a lovely partner who keeps asking her to marry him, she might one day i hope