Corn Snake Sneezing

[formica]

the fact that she moves according to the decor, is an indicator that the enclosure needs a bit of tweeking to make her more comfortable, and that the heating may not be setup quite right.

how many hides does she have access to? sounds like she is a bit timid, and may be better with more, at diffrent parts of the encosure, to give her a wide range of temperature and hiding opportunities. perhaps 1 cool, 1 cool and humid, 1 in the middle, 1 warm, and 1 warm and humid. Cant hurt to add some more foliage decor aswell to give her a bit of extra security, so that she can hide according to tempreture, rather than worrying about being secure.

is the UTH on a thermostat? is the enclosure raised slightly to allow a small air gap below the UTH and enclosure? the enclosure could get too hot without these (or too cold RE. thermostat), especially with a heat lamp aswell, which isnt really needed with a correctly setup heat mat.

What tempreture does the substrate/enclosure floor get to when the heat lamp and UTH are both on? and when just the UTH is on? needs to be checked with a digital thermometer, prefrably an IR gun type

once those things have been checked, have you tried a diffrent substrate? she may be sensitive to the dust from aspen, try coco husk, coir soil or cyprus mulch, or even newspaper, although with her apperntly timid nature she will probably prefer something she can burrow into a bit

corns are mainly active in low light, dawn/dusk, they dont really need UV, i've never used it myself, and I dont think it could help with the sneezing either way