I had exactly the same questions when my LO was about that age. As far as I could tell, as long as she is going the number of hours you want between each feed, and is not being fed to sleep, then it doesn't really matter where the A time falls.
We used to do E - A - S - more A - E etc, and I would cluster feed in the afternoon as that was when DS was hungriest. The main thing is that she doesn't depend on feeding as a prop and learns to get to sleep by herself. As they grow older this is a godsend!!
Hope this helps.