when they gulp its just telling you "I don't like this , leave me alone" lol. And they will puff up there beard a bit. That's totally fine.
But with a respiratory problem there beard feel like it full of jelly. You will defiantly know the difference when you see it! And breathing sounds crackly.
On the good side though it usually can be fixed easily
Just make sure she basks at the right temp, if you have a under tank heater you could put that on overnight.
if its going into burmation that could be a bit trickier as they just want to sleep, I think I would just have to interrupt it and put her under the lamp for a bit each day,
correct heat and light will fix most problems people have on here,
If its not serious it should clear up in a day or two, but if it dosnt get better I would go to the vet as it will need some meds.