My advice is either to candle them (3 at a time so you don't get confused), mark the ones that are viable/moving, throw out the ones that are not fertile or moving. Smell the eggs, tap on the round, large part of the egg a few times, put next to your ear. If you hear a faint tapping/popping sound you will have chicks in the next 2 days. If they are too early and you can't candle, (you can use a flashlight or phone light for this also, though not as reliable for candleing) go by smell and if they smell like anything at all (rotten or have a nasty smell) carefully, immediately throw those bombs out!
If you don't smell anything and can't candle them, I'd give it another week, try again with the tapping and smell test, then throw them all out. I'm not sure when or how she would be sitting on 14 vs 4 to begin with, but if they aren't fertile or she hasn't been devoted to sitting on them, they won't hatch. You may have some sneaky hens that are jumping in her spot and laying when she gets up. I had this same problem recently. One of my hens was initially on 12 or 14 eggs and then ended up with 20. After most of them hatched, I candled the others and they were only about a week or 2 along in the incubation process, so I had to place them in our incubator because she already had chicks to tend to and the others would be 2 weeks apart in age if she kept sitting.
I think the smell test, candling test, and the tapping test are the best methods in your situation. I never would do a float test because that can chill the egg too much if there is life inside...
Another tip is to feel the eggs, I've noticed that if an egg is infertile or spoiled, it will be A LOT colder feeling than the others and if you kind of shake it (not hard) in your hand you can feel something move back and forth.