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Because Adelaide explored Mars, that inspired Susie a to explore Mars a bit. When Adelaide committed suicide, she couldn't explore space like she wanted to, so that inspired Susie to fulfil Adelaide's dream.Yuri and Mia were the only people who knew that Adelaide was magically transported back to Earth but then killed herself. Presumably the police would investigate a dead body, but Torchwood or UNIT or C19 or whatever could have figured out what was going on and covered it up before anyone knew it was Adelaide.