It is true that some make better broodies than others, but this doesn't mean yours wont bring them eggs off, I had one out of a batch of ex battery hens I bought from a sale that was a useless layer but an excellent mother.
My father who was a gamekeeper and grew up with keepers from the old days swears by Light Sussex X Silkies and credits them with being the best mothers.
My own best broody is a mixed breed bantam, last year she hatched and reared 6 clutches of eggs, and laid a grand total of 4 eggs herself.