She is young so she may not have the broody instincts yet
They are the best at sitting on eggs when they are ready
For loosing then it could be she is young and do us dad and maybe things just aren’t strong enough yet
If you were to gather those eggs each day and set them in the nest box she...
The shadowing in the picture look like it should
Before the internal pip the egg will sometimes rock and even roll around abc not be where you last had it
Shadowing along the air cell and pushing on the membrane then the last thing is the air cell will dip forward really fast that side should...