fill some kongs with treats and only give her them in the crate.make it a really tasty treat like primula in the kong (not the full of additives stuff kong sells for them..they can make my dogs hyper) then she will a) associate the crate with tasty treats and b) her mind will be off you being away buy having a few food filled kongs or similar I fill old small juice bottles with dog biccies too and leave the top off keeps them busy for hours also tuna/ sardines makes a good filler for kongs too.the smellier the better..
good luck.