Alternative title:
Kidō Senshi Gundam: Suisei no Majo (Japanese)
機動戦士ガンダム 水星の魔女 (Japanese)
Genres: science fiction
Themes: mecha
Synopsis: A.S. (Ad Stella) 122―
An era when a multitude of corporations have entered space and built a huge economic system. A lone girl from the remote planet Mercury transfers to the Asticassia School of Technology, run by the Beneritt Group which dominates the mobile suit industry.
Her name is Suletta Mercury. With a scarlet light burning in her pure heart, this girl walks step by step through a new world.
Links: ANN, MAL, Official.
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The Prologue OVA is out (added above youtube link). Gotta say, I feel much worse for a 4 year old girl in these situations than the usual 10 year old boys being annoyed that their parents are working too much and die for the Gundam.