Big Books for a Little Girl - Suggestions?

Well, my friends, I have another question for you.

But first, let me tell you why I'm asking it:

As I'm sure you probably have figured out by now, I have a 6-year-old (almost 7) daughter.  She's doing well with her reading, though she's still limited to fairly simple stuff or she gets frustrated fairly fast.  I do, however, want to try to cultivate a love for reading reading in her. As a child, I read incessantly (the ladies at the library all knew us well), and I feel like it was a great learning tool for me, and I want her to be able to experience that. (On the other hand, my husband and his siblings did not read as much, and as a result, only one of them really loves to read.) 

As of this fall, she now attending another Charter school (this one run by the same board of directors as the one she attended in Lake Charles), and, unlike this past spring when we walked to school, we now have a 20 minute drive to school every morning. (It's only 6.5 miles, but through town, so it takes 20-25 minutes) Because of this, I've been checking out audiobooks from the library (using their online checkout program - I highly recommend it! You can download audiobooks and ebooks to the device of your choosing, and they return themselves at the end of the lending period - no overdue fees when you forget to take them back! Not that I have any experience in that matter, of course... *cough, cough*)  and we've been listening to them on the way to school. 

So far, we've done the Ralph S. Mouse books, Pippi Longstocking,  and we're almost done with Anne of Green Gables. I wondered at first if Anne might not be a little to advanced for her still, but she's really gotten into it! Since we're almost finished with that one, I'm thinking of what to get next. 

Here are some I've thought about getting:

• The Wizard of Oz  series, by L. Frank Baum
• The Little House series, by Laura Ingalls Wilder
• The rest of the Anne series, by L.M. Montgomery, etc. (however, since the rest of the series is more about her grown-up years, I'm not sure they'd hold her attention as of yet. This also being the problem with the rest of L.M. Montgomery's books - while I loved them when I was young, I was in my teens, I think, when I read them all, the Anne books, as well as the Emily books, that I don't know if they're really going to be interesting for a 7 year old.)

Do you have any suggestions for me? 

I know there are are the Amelia Bedelia books, Fancy Nancy, etc. and she likes those, but she can read them herself with a little help. I'd rather something a little more advanced, chapter books that are still too much for her to handle on her own, but that the story will hold her attention and make her want to read  more.

Make sense? 

Leave any suggestions you might have in the comments...I'd appreciate it greatly! :)