I would not EVER enable the situation by buying the tickets.

What we do not know is the legal custody arrangements?

Is new H a danger?

I would have a long talk with D about her safety and well being, and tell her you would like to forbid her to go, because you fear for her. However, if she wants to go, then you need to understand why she wants to go, and have a plan for her safety. You want her to have a relationship with her mom. At the very least I would arrange to have a secret cell phone for D to call you if necessary.....
I wonder if D just wants the presents? Is this why she wants to go?
I would investigate D motivation for wanting to go.
If she can not tell you, and come to a good decision together, I would let it drop.
Not knowing the situation and the maturity level of your D, this is just a beginning point.
Good luck I will check back later.
Holly


Bomb 1/06
D dismissed 11/07, attempt reconciliation. Premature.
Divorce final October 31, 2008.
OW looks like bad history. Over.
Still hopeful. Baby steps.
In R with my X.