all the years ive had and bred ferrets i have only fed them a good meal at night and they have always had a dish of dried to eat in the day ,ive never had nasty kits .i also hand feed the kits small pieces of meat so they used to the difference between food and hands
if you are saying just while you are at work ,well i hope so then should be ok .mine are left while i work ,i take them out for a hour before going and a couple of hours when i get home
she is just stressed out ,i would put the kits your keeping back with her .and to get to handle the kits without her getting you give her a bit of cat milk to drink to keep her mind occupied she will soon come round and calm down, .good luck