PR “top 381” is more manageable and more useful. The descriptions are shorter, there are lists. It’s good to start with.
Fiske goes more in-depth - wait till the 2018 edition is out.
AdMission Possible is a good book to learn how admissions work - she can read it on her own, it’s very user-friendly.
Will your sister have an opportunity to visit the US/visit you? This could be an opportunity to see a variety of colleges.
Being a girl from Egypt is likely a hook, because it’s difficult to be a girl in Egypt (compared to many other places). Anything she manages to do is likely to be magnified because it’s harder for a girl to be out and about in Egypt.
“we should bear in mind we can afford that school for 4 years then later be hopeful for financial aid to alleviate the stress on my parents” => no, for most colleges, if you don’t apply for financial aid, you’re not eligible for financial aid (unless something horribly catastrophic happens ie., your parents’ business burns down.) The most generous colleges tend to be “meet need” colleges, including LACs. Some universities, as you know, also offer merit scholarships. You could explore women’s colleges. And of course, there’s your own college.
For now, her focus should be to find activities she likes to do as well as books in English so that her fluency becomes excellent. Any book she can find and likes will do. 