Looking for the title of a book. I read and loved it about 30 years ago. A...

...teen romance....? ...Back in the days of the Sweet Valley High books. It was about an exchange student from England "switching" homes with a girl from Arizona...many adventures and learning experiences ensue...the English girl falls in love with the other girls brother on the ranch, etc. I remember loving this one and reading it again and again. Any suggestions??
 
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