Honestly I doubt running away will solve anything. At best, they'll simply be able to escape her family and live their lives together. At worst, they'll get caught, he'll get blamed for "kidnapping" and "beating" her (as her parents could pin the blame on him), and gets into major trouble, while she get sent back to her parents.
I said before and I'll say it again, they have to deal with the parents, otherwise, I doubt they'll get a happy ending.
Now if I'm wrong and running away did result in their happy ending, then I won't complain, but I simply doubt it.