She can still get pink if she wants them but I think they will be more distracting. Should I let dd get the pink blades?
If your daughter is a serious competitor, as silly as it seems, I'd say no. There are just too many nay-sayers out there, and whether or not it actually effects scores, you'll always wonder if it did if she got less than desired results.
That said- I have the purple ones (they are pretty pink, IMO), had pink paramounts, and many competitive-ish kids (local competitions, ISI) wear colored blades at our rink. I saw many kids at ISI synchro nationals in colored blades.
If skating is just for fun, the colors are fun. I don't worry about them matching my costume, and no one has ever said anything negative about them.
As for the two pieces- they don't come apart, unless you are looking at the old style matrix with interchangeable runners. It isn't an issue now.