I think I started reading the Christy Miller series by Robin Jones Gunn when I was about that age. I think they're kind of cheesy now, but at the time, I thought they were great.
Also, I liked the Elizabeth Gail books by Hilda Stahl. According to this website (http://www.readingwell.com/z-stahl.html), the original books were published in 1978, and then in 2001 they re-published them, but only some of them and gave some of them new names. I don't know why. There was nothing wrong with the originals. That just seems very silly to me, especially leaving a bunch of them out. But anyway, if you find the original series, they're really good.
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Also, I liked the Elizabeth Gail books by Hilda Stahl. According to this website (http://www.readingwell.com/z-stahl.html), the original books were published in 1978, and then in 2001 they re-published them, but only some of them and gave some of them new names. I don't know why. There was nothing wrong with the originals. That just seems very silly to me, especially leaving a bunch of them out. But anyway, if you find the original series, they're really good.