What have you done to enforce visitation?
Have you turned up and been refused?
If you haven't seen her in 4 years, you really need to file again to modify the current visitation order. She won't know you, really, and it would be in her best interest to have initially short, supervised visits in Dad's community.
Then eventually if all goes well, you'll generally be able to go back to a regular visitation schedule with overnights and weekends etc.

