> a lot of her interests are quite immature
I'm a 29-year-old who loves frozen and Unicorns, for what it's worth. Just saying.
As for apps, I'm Surprised nobody has mentioned VoiceDream Reader. If she has access to bookshare, it's the easiest way to read books on the iPhone. She might also find VoiceDream Writer useful, as it can help with writing on the iPhone. I don't use that myself though, so can't say much about it. Wordweb is another good app, providing better dictionaries than the one built into IOS. For chemistry, I hear really good things about
$1, though once again, I have no use for it myself. Also, I know Sky Safari 3 was fully accessible. However, I'm not sure about the latest version.