I would say that it is not enough evidence to change the theory because she has only done the experiment once and may have gotten something wrong. She will need to repeat her experiment at least 3 times her to see if she gets the same answers or i5 changes.
You can view more details on each measurement unit: molecular weight of NaCl or grams This compound is also known as Sodium Chloride. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles NaCl, or 58.44277 grams.