Is it normal for hognoses to make small hissing noises?

[Eggplant]

My hognose has been doing this since the day I got her. She usually only does this when I handle her. It's a kind of quiet small hissing nose like "pssth". She doesn't flatten her head when I handle her usually so I don't know if the hissing means she's upset or what..

When she really gets mad I've heard her flatten her head and hiss really loud (its kinda scary). That only happens when she thinks I'm taking food away from her.

She had a mild upper RI a few months ago; I went to the vet and gave her injections till she got better. Since then there hasn't been any sign of mucus and she's extremely responsive when I feed her. Normal activity, sheds and everything.