Everyone has given you lots of great advice, I would just emphasize that you can relax and enjoy your new baby. If you are stressed she will pick up on it, so don't worry that she is scared right now, that she is not spayed, or that she may change the dynamics of the household - change is a part of life, it can and should be viewed as a good thing. Try to accept her for who she is - if she never becomes a loving, playful, lap cat just respect her terms of acceptance into the family. Hamish will probably be ecstatic about having a new playmate, once he gets used to having her there, but that should not change his relationship with you at all.
Please keep us posted on her progress, and send more pics when you get the opportunity.
Please keep us posted on her progress, and send more pics when you get the opportunity.