Personally, I think if you're just there shadowing, there's no reason to bust your butt doing things like unloading food. When I first started shadowing, I was really trying to be helpful to the techs, because I did feel like I was getting in their way. But when one of the off duty vets asked me why I was in the back unpacking meds instead of in office visits, I realized that's what I was there to do and that's what I should have been doing. I don't mean to say that you shouldn't be helpful to the techs, because we all know sometimes we are in the way when we shadow, but there's no reason you should be doing grunt work just because this girl's being a jerk. I personally would either ask the vet if he/she feels like that's something you should be doing, or tell the tech that you're there to shadow, you don't mind helping, but it should be a learning experience. Easier said than done, I know, but what's the tech going to do? Complain to the vet that you're not doing her job for her?