Doesn't make sense
I was a big fan of the original ringu (the Japanese Version) I bought the book which was obviously different from the movie but made so much more interesting the movie afterwards.
When the American version with Naomi Watts came out I thought was really good, very spooky and cleverly made even so the back ground story was very different, but there was an element in common with all the movie, her father was of unknown origin even so in the ringu is heavily implied.
Now we all know her father wasn't human, why in this version he's a human being is hard to comprehend. Why would she have such a strong powers is for was not half demon herself.