I'd wait! As painful as it is to do so, and as much preparation you have been doing (i've been following your posts, lol

) I would totally wait that extra week to bring her home! Its nice for your mother to offer, but if it were me, id want the pup to get to know me first.

Im stingy like that a i guess! Give her that extra loving time with her mom before she has to say goodbye!
That's just me though! Good Luck on your decision, and keep us updated!