A minute at a time is great. Do that several times a day, and slowly increase.
Our youngest hated tummy time so we never done it 
she was our earliest walker at 9.5 months old 
my baby boy dont like much but once a while on chest more then will understand it time for tummy time
Check with the pediatrician to rule out medical reasons for her discomfort.
What in the world is tummy time???