Have you tried to crack one of the A&M's eggs open? Could be they already are fertile. When you crack it open you should be able to see a white dot in the yellow part. If the egg is fertile, there will be a faint white ring around this dot. It's called the 'bulls eye' if you want to search for pictures.
There could be many reasons for a bird to drink unusual amounts of water - it could be hot, dehydrated from being very active, one of the others can have kept it from the water dish for a while and so on. As long as it acts normal in all other ways, I wouldn't worry. Just keep an eye on her.
With regards to bachelor pads fighting: according to what I've read, it's usually not too bad, as long as there are no hens around.