The spider will be fine and the smell will eventually go away with time... if you have some spare time to sit around, just open the lid to let some smell out and keep an eye on her to watch her from trying to escape. They don't move all that fast...
Yeah I've been doing that so far. They are all set up in their webs and don't move at all when I open the lids.
Try and stay away from feeding fish flakes to crickets - it makes the crickets stink and I'm sure uneaten feeders will also stink in a very short time. I havn't used crickets for years now, I hate the things, I won't even feed fish food of any sort to my Red Runners.
Yeah I do want to get away from fish flakes but so far because these ones grew up on them they are really picky and didn't eat the other foods I tried.
I simply feed slices of fresh fruit and vegetables to my feeder crickets.