How long do you think until she'll 'get it's and lay there. 
As I said above:
If the egg shows up in random places she does not have control yet. That should come pretty soon, probably within a week, two at the most. If the egg shows up in the same spot every time she has decided that spot is her nest. If that is what is happening get back to us and we can discuss that. 
I'll try to phrase it a little differently.  Once she gains control she will decide one specific spot is her nest.  That may be your nests or that may be somewhere else.  That could happen today, that might not happen for a couple of weeks after her starting to lay.  Each one is different. 
Also, will the other girls follow suit? 
Good question, that's why we use fake eggs.  Many pullets and hens (most but not all) seem to like to lay where another hen is laying.  If they see an egg in a nest they seem to think that another hen thinks is a good place to lay.  So we use fake eggs to make them think another hen is laying there.  Sometimes it works, sometimes it doesn't. 
I have noticed that when I have adult hens laying in nests the pullets seem to learn from them and lay there.  I still occasionally have a pullet decide some other place is a good place for a nest but most choose where the hens are laying.  I also occasionally have a mature hen decide to stop laying in my nests and hide one somewhere else.  I don't know why other than each is an individual and you never know for sure what one will do. 
The eggs all had beautiful yolks in them.
Excellent, the pullet has learned how to put one together properly.  Don't be too surprised it you get a surprise but it sounds like you are off to a good start.  Any pullet or hen is entitled to an occasional oops but once they start putting an egg together properly they usually keep doing that.  So now they should should gradually get bigger.