I would keep them separate when you are not home until you know they are going to be okay together. Even though the age difference isn't that great, this isn't too different from getting a new pup with a full-grown Yorkie.
You will need to give your girl time to adjust. Could take a couple of days, a couple of weeks or maybe a little longer. Congrats on the new addition and I hope it works out well for you!!
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