I stay at Le Germain every time I am in town, first of all it is a great hotel and the location is awesome for even the non-cheesy stuff such as King street dinning and clubs.
You should know that their restaurant and bar is not open yet-but you can ask for signing privelages at affialiated restaurants Zoom and Rain(directly across the street) They serve breakfeast on the mezzanine and there are fully stocked mini bars in every room.
As far as SP friendly, its a bit of a tough call, they do not have a door man standing at the doors, but the reception directly faces the glass front doors and they can see everyone who comes and goes..they do make a point of knowing all their guests by name. There are no side doors, and the elevators are direclty to the right of the front desk...the whole hotel is based on an open concept including the lobby so it would be difficult and not reccomended for her to try and sneak in on her own.
My sugestion would be to meet your "friend" elsewhere and return to the hotel with her on your arm as if returning from a date and proceed to the hotel and to your room...
good luck
rolo