After making a striking solo debut with “Body” in September, girl group WJSN’s Dayoung is returning with a follow-up that aims not to repeat that success, but to move in a different direction. Dayoung’s second solo EP, “What’s a Girl To Do,” released Tuesday, follows the strong performance of her first solo, which marked a breakout moment and helped establish her as an act distinct from her image in WJSN. With the new EP, Dayoung further expands her role as a solo artist, taking part in writing