Sensei, for purposes of analyzing match-ups I think it's probably a coin-flip - I probably would stay with Serah like you did. Serah will certainly be jumping center with Skylar at the tip-off. After that, I'm pretty confident Skylar will be all over the place.
I expect Marquette to run a bunch of high ball screens utilizing Skylar, so a lot of the coverage up top will depend on how UConn prepares to switch.
I imagine after watching film, Sarah, Serah and Blanca are salivating about the possibility of guarding Skylar, and jockeying for the assignment to do so.