If she is only 3 weeks old, do not separate from the other rats, leave her with mom until she is weaned. Avocado can be deadly to many animals, and while I believe it is just part of the skin and the seed that are an issue, I don't like to risk even giving the 'meat' to my rats or birds.
Are they wet sneezes or dry sneezes? With rats you are less likely to see "pus" with a respiratory infection and more likely to see porphyrin (a red secretion that looks like blood, and acts as a lubricant for their nasal passages - shows up in excess under stress or during illness)... of course since she is only 3 weeks old, mom is likely to groom anything off of her before you notice it. If she is still active, eating, and getting plenty to drink, it could be she is more sensitive to the dust in carefresh. Try putting them on plain paper towels and keep their enclosure very clean. If the sneezing doesn't go away in a couple days, bring her in to the vet.
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