I was going to say (as usual) the All of a Kind Family books, but flea beat me to it.
Some Judy Blume would also be perfect for her -- the Pain & the Great One series, and the Fudge series.
Oh, and the Penderwick books!
Sorry, I keep adding -- what about Sam the Bat? [link]
Gone Away Lake.
Elizabeth Enright rocks hard.
Half Magic and the rest of that series are great. So is Pippi (though also, not entirely devoid of problematic racist bits).
SAM THE BAT OMG. The request was for a series (because she reads so friggin' fast), but YES. Why do I not own that already? I have FAILED as a Buffista parent, clearly.
We have a few of the Oz books (from my grandmother, when they were shutting down the store and trying to get rid of old stock), but I can't remember which ones.
We are mysteriously lacking in Beverly Cleary and Judy Bloom in this house - I think we have Mouse and the Motorcycle and maybe one or two of the Fudge books? All my old copies were read and reread and passed down to three siblings, and either they're up in Canada now, or just disintegrated into literary dust.
I'll look into Junie B Jones and Ivy/Bean too.
Maybe the Dragonbreath series? [link]
Alonng the Junie B. and Ivy & Bean lines, there's another sweet series with a heroine named Clementine -- can't remember the author's name, though. Sara loved them.
It looks like I posted in Bitches instead of here, but it looks like most of what I said was covered. Except Roald Dahl.
Sara Pennypacker does the Clementine books, which are very good. I totally agree that a lot of the older books are going to be great for this age, though you do have to keep an eye out for bits that might be racist/sexist/etc. Would she like the Frank Einstein books by Jon Scieszka, or the Origami Yoda books by Tom Angleberger? Or the Family Fletcher books by Dana Alison Levy (which are kind of like the Ramona books but with four adopted brothers and two dads)?
Yes, Ursula Vernon--Danny Dragonbreath and Harriet the Hamster Princess.
Also Zita the Space Girl, which is hella fun.
The Stick Dog books by Tom Watson are entertaining.
The Humphrey series by Betty Birney, about a classroom hamster named Humphrey.
The Noisy Village books by Astrid Lindgren
The Judy Moody series by Megan McDonald
The Ellie McDoodle books by Ruth McNally Barshaw are a less-obnoxious example of the Wimpy Kid/Dork Diaries genre (my kid didn't like Dork Diaries till she was a few years older).
Barb!!!!
Between Here and Gone
just showed up in my BookBub feed!
You're the second person I know to have a book show up there. The first was one I actually edited when Drollerie Press was up and running.