So this is my interpretation. It still makes sense if there was no father who stuck around. She doesn’t know who the father was. The father was never part of her or Anakin’s life, so she can’t explain who the father is.

The explanation that it was a virgin birth is a possible interpretation, but when I saw the movie that didn’t occur to me. I thought she was like all the other single mothers who’ve had to raise a kid without a father.

She is also a slave and we don’t know a lot about her history. It might be that Anakin’s mother had some history she didn’t want to share.