She is 25lbs. And the bone was about 2in. Lond and 1/2 in wide. What should I do she had no problem getting it down so it got through the neck and she seems fine but how is it going to come out.

Keep an eye on her. Sometimes dogs can pass these things.
Do you think it may have splintered? If so, feed her cotton balls soaked in broth or bread to soften the sharp edges.
Look for things like refusal to eat, vomitting, diarrhea or no stool, lethargy, etc etc. Sometimes they can pass, but they can also get lodged.

Thank You I am so worried

If you are very worried, take your dog to the vet in the morning. They can take an x-ray to see where the bone is.