This one may sound really dumb but here goes - do I have to keep the reptile bark in the freezer, or can I take it out and leave it out after awhile?

Also, tonight when I took her out to feed her, she coiled around my fingers really tight, and I had to really pry her off. She didn't like that at all. I know they told me with my corn snake that I should never feed her in her enclosure because she may bite me when I try to take her out thinking I am food. Also they said it was bad for the corn to ingest any substrate. Any thoughts, opinions or suggestions are welcome. I am new at this, and am trying to be a good mommy.