Toys are a good idea, stuffed kong or puzzle toys could work. She's not home alone long though and I don't think you should feel guilty. Someone's got to earn the dough to pay for that lovely warm (or cool) room she enjoys, not to mention all the food she eats and free health care. If you are really worried you could get her a friend or send her to daycare, have a dog walker come or even install a doggy door so she can get outside. As long as she is getting enough mental and physical stimulation though I think its okay that your dog isn't your full time job, she's got it pretty easy and we've all got to make our way in this world.