Congrats on the new baby! I'm sure you are just beside yourself with eager anticipation.
If at all possible, can they begin meeting now at the puppies current home? If not, it would be beneficial to take Bailey with you when you go pick up the puppy and let her meet her somewhere other then "Bailey's" home. If they can meet on neutral ground then Bailey's first interaction won't be having to 'protect' her home turf.
Also, don't be stressing and fretful about the meeting and them getting along. Bailey will surly pick up on your nerves and can in turn, be nervous.