A Dreamy Sonata seems to be a Santa Anita horse. In both her 3yo & 4yo seasons, she seems to have a distinct liking for Santa Anita, which really limits her to racing from January to the end of March. You could bring her back to SA in the early part of the New Year and see how she does there then you could still retire her after that. The biggest drawback to that is that you'd end up paying Taxes on her twice at the end of next year, once as a Racehorse and once as a Broodmare.
As for Pink Slew, I would have said that she seems to like both of the California tracks, Santa Anita and Del Mar, however, she blew that theory out of the water by winning at Aqueduct last time out. Maybe give her a couple more races at Aqueduct before the end of the year then make your mind up about next year when you she how she does in those races.
Hope this helps.
Good luck with both of them.