most cats are slow to become accustomed to a new home and people. Give her time and lost of love and patience (as I'm sure you will ) I'd guess by the end of the week she'll be venturing out into the house. The best way to introduce cats to each other (the I have found) is to have them both in your lap (you holding one and hulky the other) and let them just look at each other for a while before getting them too close. A very slow introduction has worked best for me. Letting them feel safe (while in your arms or on your lap) will help them know that the other cat is not a threat.