Looking at Katie's stats, I suspect she's still carrying an injury. She only got 4 out of 19 (21%) 1st serves in in the 2nd set. She was easily broken on her last 2 service games but had 4 break points, which she failed to convert, in Ercan's last 2 service games.
Oh, very nice work by Marni! Will be good to see how she measures up against Hon. Their only previous match (that I can see) in July 2022 went to Hon in 3 sets.