You might try giving the District Attorney a call, not just one of his or her assistants. You could also consider getting the media involved to put some pressure on the office,
Although people often don't think about hiring a defense lawyer when they -- or a family member -- are a victim, nevertheless there are advantages to doing so. It can help facilitate communication between you and prosecutor. You can be told when, realistically, the case will go to trial (so you don't take time off for every subpoenaed court date). Your lawyer can also communicate with defense counsel in ways that serve your interest: e.g., helping the case settle to avoid a trial. Lastly, your own lawyer can explain things that the prosecutor may not explain well, for example, that your daughter might not be competent to testify and therefore the state's case may not be triable at the moment (though it may be triable as your daughter matures.)
Some district attorney's have persons in their office designated to be the contact point for victims and witnesses. If your district attorney has such a victim/witness counselor, contacting such a person could be a better method of getting information on the case. It may be that that the DA views a case with an adult witness as easier to win and the DA may be trying to spare your daughter the stress of being a witness, but only the DA can answer that for you.