Fostering her out would be insurance against defeat. Placing her with pure-blood allies would not suffice for that eventuality, as such allies would most likely be going down with the ship too. Placing her with muggles takes her out of the war entirely, and the trace means she gets back into the wizarding world 11 years later no matter what happens..
Uhm. This is spookily compatible with Canon. For a girl with supposedly loving parents, she spends an inordinate number of holidays at hogwarts and the burrow. Worse, we never actually meet said parents at all in canon. We are told. By Hermione, that they get shipped to Australia with a case of amnesia. And I mean, "my parents are dentists" is exactly the kind of lie a clever 11 year old orphan might tell people to get them to iose all interest in further enquiries. So, basically, her family could oh-so-easily be entirely fiction in-universe.
Actually her parents, or at least people claiming to be such do appear in canon, if barely. They get no dialogue, but during the shopping trip in the second book there's some mention of them being uncertain around all the magic and weirdness, Arthur Weasley saying something along the lines "oh wow, I get to meet real muggles, look they're exchanging muggle money!", and few lines about them being unnerved by the confrontation between Arthur and Lucius in the bookshop.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 97. The previous thread is at nearly 500 comments.
There is now a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system.
Also: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: