Splash/ splash = splash. Splash / blue= 50% splash 50% blue. Depends how many chicks you are hatching from that hen too. In order to predict the colours of your chicks you also have to know the genetics behind your blue. Perhaps she has splash in her line too.
I suppose she just might. I was really looking forward to blue though. I'm not sure color she really is. To me she seems like she's black.