Pound on the wall. She should get the hint.
Same thing happened to me about a year ago. I responded with banging on the wall. She was loud the next night, so I pounded on the wall again (this was around 11 at night) and then got up at 5 and started pounding on the wall in the same fashion as the night before.
She has been quiet for about a year now. I think being woken up at 0500 set her straight.