Student midwives (not trainees) can do as much as you want or as little as you want during the labour. They should be a support not a hindrance though. I've had mostly fantastic experiences with women whom I've been following through. I attend all antenatal appointments (if I can), and have been at 3 labour and births over the past ten days where I've been lucky enough to catch the bubs as they made their way into the world. I think that you should call your student and talk with her about the program as it sounds like you consent hasn't been very informed. The relationship can be mutually rewarding as long as you both have clear expectations of each other and you communicate!