The answer is: “The Dandelion Girl” by Robert F. Young, thanks to a now deleted post below.

I started reading this at work a couple weeks ago, but wasn’t able to finish it at the time. Got a light morning, so I was trying to find it again, but to no avail.

I have a sneaking suspicion of the twist the story was building towards, but I wasn’t sure how the author was going to pull it off, as it seemed to be a textbook time travel paradox.

I thought the title might have something to do with flowers, but including that in my searches did not yield results, even after filtering out all of the “Flowers for Algernon” results, so I might be wrong.