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Is my spouse nonresident alien or resident alien if H4 to F1 change of status happened in last year (2016) and she arrived with H4 in 2014?

My spouse arrived in US in March 2014 and lived in US for all years till today (April 2017). She arrived with H4 Visa. H4 Visa got converted to F1 Visa in last year (2016) January. For filing my tax return,  Is she considered nonresident alien or resident alien?