No, as long as you keep taking it slowly, and don't get extra nervous, it should not affect the progress you've made. Keep treating her gently, and spend time just sitting near her, and getting her used to your voice and your scent. Some chinnies take longer to adjust than others. And remember, if anything picks up a chinchilla in the wild, they are about to eat it for lunch, so being held is something that will take a lot of time and trust to make her feel safe when being held. When you DO hold her when it is necessary, always make sure her hind feet in particular are resting on your arm or chest - they need that to feel at all safe.