could she just be "huffing?" They will sometimes release air and do a little head lunge to scare you off. Suppose it could appear to be sneezing. If oyu are going to vet for the first time be sure to bring a fecal sample and have checked. This should be done about every 6 months. it is cheap ($12-$20 depending on where you live)
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Chameleon Help & Resource Info
0.1 Veiled Chameleon - Luna. She's now hanging from her big jungle gym in the sky
1.0 Beardie - Darwin
0.2 felines - Kyndra and Lita
0.1 African Clawed Frog - Skipper
0.1 Mad. Hissers and she is on the loose!
0.1 Chilean Rose Hair Tarantula - Rosa Leigh
0.1 Goliath Bird-Eater Tarantula - Natasha
?.? Pinktoe Tarantula - no name yet