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It's about the way she said it, she used the phrase あんたとタメよ that means their equals, socially, they are in the same conditions, grade, bc she only knew they (Sakura and her) were in the same school grade, she didn't know his age just the grade
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she could had say あんたと同じよ" or”あんたと同い年よ" that means something like "I'm 16 years old, like you" or "the same as you" but she used "あんたとタメよ" If you wanna know more I can send you the link with the information, but keep in mind it's in Spanish