**SIGH** ok my first thought isn't RI here are some things to look for before jumping on the "Sounds like and RI" kick.
Two things first she's isn shed.. so they can be irritable making them breath harder so it's possible she was hissing at you she is a snake after all. Second she's in shed sometimes the skin around their nose get all weird and makes noise when they breath it can even whistle somtimes..
As for the gas bubbles its sounds like air in her air way or gas in her digestive trac..
Keep an eye on her and if after she sheds and if it still happens take her to a vet ..