Sorry I don't know much about Aleks to know how it might map to one of the other distance learning programs.
If I were you I would have dd try out Alcumus:
http://www.artofproblemsolving.com/Alcumus/Introduction.phpYou can create an account (which is free) and go to the Alcumus database of questions. Once there, you could set the topic to Algebra and let your daughter try some of them out. That will give you and her a sense for the difficulty level/style of question to determine if your dd is ready to/wants to do more Algebra or move onto something else (Geometry, Counting and Probablility...etc). If she likes the database, you could enroll her in a class and/or buy the associated text book (which we think are really beautifully written).
While you are on the AOPS site, you might want to read the Calculus trap:
http://www.artofproblemsolving.com/Resources/articles.php?page=calculustrapPersonally, I think it is good advice.
Just my two cents.
Oh, and we chose AOPS because it looked like more fun, more challenge, and more interaction with other students, teacher...
