That's great! My hen got it straitened out too, adding the oyster shells to the water did the trick, it took several days but finally we got a normal egg from her
I have a hen that's doing the same thing, she is about 9 months old and has always laid either a soft shelled egg (usually dropped under the roost) or if she does happen to drop a harder shelled egg its unusable as its covered with a baking soda like substance that wont wash off and when I crack...