Told your 99 that you have lost the keys, so you have to change the door lock.. but NEVER give her the new set... even tell your C6 don't give it to her either... But you must change the lock...
If she keeps on asking you for the new keys.. just tell her you will give them to her next time...
your 99 has to learn to respect the privacy of others... my 6299 also has our home key, but they'll call before they come, & they'll only come when we are in need. i also has a cat with me, 6299 worried the cat hair will not be good to the BB, but we just ignore them...