Sakura was still in the base when PB's troops left the base to attack the Wily II star. It's not that she didn't want to go, she wasn't really that much of a pilot, her specialties were more of infiltrating and blitzkrieging armies and one on one fights rather than shooting down enemies with various aircraft warfare. So she volunteered to stay behind at base in case something happened and defend it, she was PB's second in command after all.
Since she was in space now, she felt a change of attire was in order because space was known for being cold and it was a time of war. She wore a crimson partial body armor that covered her chest with pointy pauldrons and a black full body suit with a bikini like, for lack of a better word (at the moment), crotch plate. On her legs she wore red mechanical boots and her arms red mechanical gantlets with white finger less gloves. Along with her change of clothes she also cut her hair, it now reached just below her chin and the back was flared and layered. She also had two strands of hair close to the front that reached her chest. The armor was light and flexible despite the somewhat robotic appearance and while it did accentuate her curves and figure and wasn't the best protection, she felt that the speed she gained from the light armor was a reasonable tradeoff and also since, she was PB's second in command, it was probably alright to look a bit more sexy.
As she was doing her patrol with her trusty Z-Saber at her side, she saw what looked like PB walking down the hall. She was a bit suspicious as to why PB was here when he clearly left to lead the awesome armada of mechs and arwings. She knew something was up, the being she saw certainly had the ego but something was missing. Decided to confront this "PB" cautiously so he wouldn't suspect something as, she wanted to figure out what he wanted and to deal with him.
She approached him casually and called out to him "Yo, PB wait up!"
"PB" turned around and greeted her with a smile that, like his Ego, didn't seem right. It wasn't particularly strange but it didn't seem natural. She definitely didn't want to let him know he wasn't supposed to be here.
"Hey boss, glad I found you. It's so boring right now, mind if I tag along in whatever it is your doing?" She only hoped to Dr. Light that he didn't suspect anything.
(For what the chest plate looks like it would be similar to the picture below, but with pointier pauldrons and more feminine and robotic.)