My daughter wrote
Sarah has been reading books about gardening.
I am a little confused as to how to categorize this. Can it be considered Present tense? Is this sentence acceptable?
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Yes, it's acceptable and part of present tenses grammatically.
There're four present tense forms:
Present simple/simple present: Sarah reads books about gardening.
Present continuous: Sarah is reading books about gardening.
Present perfect: Sarah has read books about gardening.
Present perfect continuous: Sarah has been reading books about gardening.
Please bear in mind that the action (reading the books) in your example, has been done from a point in the past until now.