Are you incubating or letting her? Some people do not like to incubate pullet eggs. I have had Serama's hatch their very first clutch of eggs laid without any problems.
We were thinking of incubating them.. They have been laying over a month now and the eggs have grown in size greatly. I heard Welsummers don't go broody to often.. but if one does we can go that way as well...HOw old do they have to be to go broodie???