I would just try and see what happens. Is she used to her collar yet? If not, get her used to that first before introducing the lead. Just pop it on for a few minutes and distract her with a toy or a treat. If she starts chewing the lead, again use distractions and praise her wildly when she lets it go. Do very short sessions at a time and gradually build up. I didn't let Archie drag his lead around, I held on to it but I just followed him about rather than trying to get him to come with me. Once he was used to the lead then I used a toy to get him to follow me around. You cant force her to stay at your side, you need to teach her that that is where you want her to be. There are various ways of doing it and I'm sure your class will have a specific method but I wouldn't worry too much in the early stages. Just let her get used to the idea of the lead at first. Have a fun weekend.