Hey! I paid for the fire dancers for my wedding. I had them perform after my reception ended on the terrace - at 10:00 pm (I added an extra hour onto my reception). They performed from 10:00-10:25pm in the large grassy mall area, and they designated this the garden fountain area. However, my wedding was in February. This was the latest it could go because of the noise ordinance that the events outside need to end by 10:30pm.
I think what she probably meant is you cannot have a fire pit on the beach - I don't know if that is allowed on any of the resort owned beaches in Mexico.
FYI - I paid for the fire dancers for after the wedding, but half of the resort showed up as they performed; it is not private. The resort also had them scheduled during their weekly night activities for free (I think it was around 8:30pm).
Cost: 35 minutes - $950 + tax ; 45 minutes - $1250? + tax AND the price changed 3 times, it was first $850, then $900, and I paid $950.