i wouldn’t recommend it for two reasons
1 with dwarfs if you mix same sex pairs from two litters together they are highly likely to fight due to different smells and as you might be doing this you may need to put them in single cages at a young age
2 what about pedigrees there is a chance you could mix hamster from the litter up and give people the wrong pedigree and could end disastrously if there were some nasty recessives lurking around. some one could get eyeless whites or somthing simular because of your mistake
I wouldn’t attempt it for the above reasons
and smartie has been througth a lot why not give her a week or to to rest before trying again