I am on my second batch of chicks. I learned the hard way on my first batch. One died after a couple of days and then after they got big my dogs finished them all off but one. She is doing well and laying. I have many questions. When can I introduce her to the chicks? They are in separate pens but they can see each other. Also she has been acting strange and not eating much, but I don't know why. She doesn't seem sick. Any advise would be appreciated. Thank you..

What are the age differences? 2 weeks is ok, and you could probably mix her in, but if the older group is more than 2 weeks, you might let them see each other for a while.
to have you here with us. Enjoy your time here at BYC!