For additional help you can post in the hatching forum. People are really quick to help with any problems that arise.
I had a really rough time with hatching guineas(first time hatching ever) and had to assist a few. Humidity issues on my part. People there helped me a ton! Best of luck with...
No. She is not ready. You need to wait for the veins to shrink up and not be red anymore. Watch the beak. As long as it keeps making a “chewing” motion it is still absorbing the yoke.