How can I help..

I don’t know how to help my sister through one of the hardest breakups either of us have ever experienced... she was with him for 4 years and has just ended it after someone anonymously sent her solid proof (messages videos pictures) that he’s been sleeping with someone else the whole time.. they have a 5 month old together plus she has a 10 year old from a previous relationship that also ended badly.. this guy has now turned verrrry ugly, to the point he’s got her car key and house keys and won’t give them back... reported her car stolen as his own and we had to prove it’s hers and that he has no right to it as they weren’t together when it was brought for her... plus so much other childish crap... I don’t know if my words are enough.. how can I show her she deserves more and she’s loved and she’s not worthless? 😥

Ooo