We've had Hazel since November 1/18 she is over 2yrs . We adopted her for my wife. We just adopted a baby girl age is 4 months. They both get along well. Hazel this morning started to make a nest in our closet. Taking timathy & what ever else she could take in her mouth. She has built a great nest. She also took a stuffed bunny off our bed and put it by the nest. She isn't fixed & we don't plan on doing that to her. Why has she built a nest ?? Is it for the baby ?? No males have been in our house. Should we just leave the nest ?Thanks for the replies wife is very worried.