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Summer flowers in Vermont- I thought it was a feverfew but I'm not sure
I believe Forest Dragon is correct. There is an old fashioned feverfew called white wonder that fits this image. It is sold as seed for cutting gardens. It is marketed under the name Chrysanthemum parthenium 'White wonder' or Tanacetum parthenium, White Wonder.
They do look similar to Feverfew, Tanacetum parthenium. Some of the images had flowers with more yellow but there are ones that look like yours as well. That's just my opinion. I am not very experienced with plants. Very pretty, by the way!