Oban Star-Racers, Mouretsu Pirates Recommendations
While Oban is listed as shounen, many consider it to be somewhat of a shoujo series as well, like Moretsu. Moretsu is definitely a bit more on the shoujo side.
Both series have strong female leads with a futuristic world and space travel. Both are about a ship crew with a teenage girl being the key component of the crew.
Both series are also 100% accessable to kids.