That sounds like an excellent idea, it will break her day up, and if you can do that then she may not be as over excited as she is at the moment, of course she is going to get excited, she is a pup, and been on her own all day, this is only natural, and when pups get excited they dont listen to well, once you get in to a routine, of someone take her out for regualr breaks, she will no doubt settle into this routine, and when you come home she will be a little excited but not as much as she would be after being locked in all day.
Good luck