Her customs range from 600 to 1000, You tell her what you want, a plot if you got one, cosplay presences and etc, I believe it's like 10 mins long unless you fork over more dabloons if you want it to be longer.
You'll also be waiting months, maybe a year or so for it to be done cause she apparently still has a long waiting list.
I got mine via contest dono and it was only for 2 min, which I didn't get until 6 months later when I had MV staff remind her. So yeah, too risky if you ask me. Lesson learned.