I think the decision is ultimately up to you about what you are willing to risk. She is really still SO young, i'm still in awe that she's away from her mother and litter-mates. How many days of the week would you be bringing her there? If it's only 1 or 2, when you are gone all day, i wouldn't risk it. It sounds like you are home enough the other days of the week that it will be okay for her to be alone, as long as you have someone come home to feed her and play with her. That really, to me, sounds like the better option! If she is only 9 weeks it sounds like she probably hasnt had many of her vaccines. A very sick, young puppy is never something you would want