They've already said that she won't have any more erotic content different from what has already been shown. I don't know the reason for this; only the developer can answer.
P.S. Sorry if there are any errors; I'm using a translator.
we have never stated that Haniya won't have more content, she is even getting content in 1.9 with the endings, what we have stated before is how she won't have a steal route / content not involving Gabriel.
