What does the 12 yo want?
I’ll be honest, at 12 having lost her mum and then being the subject of court proceedings which will no doubt have cost her dad money, doing a long drive for the sake of a visit doesn’t sound ideal.
Maybe ask GD what she wants? How she feels? She’s 12 and will have opinions and feelings - maybe put her at the fore of this?
Ask her if she enjoys the visits the way the happen just now, spending several hours in a car?
As she gets older, I don’t see this as sustainable, what about extra curricular activities, friends, etc? These things will all be based around where she lives.
I agree with others who’ve suggested that maybe finding a way to spend time with GD in the area she resides might be less stressful and more enjoyable for all of you.