How exactly is her fur coming out? Does it come out when you pick her up? Is she just shedding a lot, or do you have bald spots?
There can be many reasons for fur to come off a chinchilla, all depends on how it is coming off.
What kind of diet are you using right now? Seizures can be a sign of calcium deficiency, thiamine deficiency or low blood sugar level (or heat related if the chinchilla is over heating.). Giving more of an explanation of what is going on, might help narrow down what can be the cause of the problems or if it is a serious nature or something simply fixed by a quick change of diet or circumstances.
Also have you ever taken her to a vet to figure out the cause of the seizures and how long have you had her, that she has been having these problems?