S.L.
Well, I learned the hard way that you have a problem if you say 'how do I get my child to.....'. You are the parent and you need to teach the child you are in charge and yet love them. Be firm and yet gentle and put her in the crib, say it's nap time, then leave. We just went through this with my daughter's and son in law's twins and they slept here on some weekends due to parents jobs. It was screaming and at home they would be gotten up, etc. We, parents included, decided it was time to stay in the bed so we shut the door and left and after about 2 nights no more crying. I can put them down for a nap, or for bed at night, kiss them and say nap or bedtime, I love you, and go out and no crying. They also do that at their home now fine. You have to let them know that's what is happening by not going back and getting them. I did that with my first child and it was a nightmare when I had my second child 12 months and 5 days later. Don't be afraid to do what needs done whether your child likes it or not. They are a child and not able to know what is best for them. The sneaking out thing is what I did and I ended up being there for hours and still he'd wake. That will not work.