chams clear salts via their nostrils. Have you changed her water source lately? From bottle, to tap or other? If you are giving her tap water be sure to let it sit out overnight to rid chlorine (unless you have well water).
As for temps, 10-20 degree drop in cage is OK. You might want to get a digital thermometer where you can check min/max on a 24 hour period. You can get one at home depot for under $20. I have one by Springfield that also measures humidity. You could also cover her cage with a blanket after lights out to retain some more even temps if you feel it is getting too cold. Of course your other option is to give your roomates the boot! lol!
One last note. You say her eating seems to be crazy...be aware that they reach sexual maturity at about 6 months and females will develop infertile clutches of eggs. Overfeeding can be a trigger for frequent and large clutches which puts undue pressure and stress on her and her body. Luna, my veiled had 4 in 12 months and died a few months afterher last. Long story, but we believe the frequent egg development was a definite factor in her demise, wehich was caused by a burst vessel. I do not mean to scare you(!) just be prepared and once she hits about 6 months or so you may want to regulate her feeding a bit.
lele
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Chameleon Help & Resource Info
1.0 Nosy Be Panther Chameleon - Cyrus
0.1 Veiled Chameleon - Luna. She's now hanging from her big jungle gym in the sky
1.0 Beardie - Darwin
1.1 Side-blotched lizards - swifty and blotcha for now
0.2 felines - Kyndra and Lita
0.1 African Clawed Frog - Skipper
0.1 Chilean Rose Hair Tarantula - Rosa Leigh Died 4/21/06 
0.1 Goliath Bird-Eater Tarantula - Natasha donated to science 4/4/06
?.? Pinktoe Tarantula - no name yet
