Thank you everyone for responding and for some of you for trying to track down someone to offer insight. This is new for us, new for her coaches/gym and well, I guess we'll just figure it out as we go along. I did talk to someone from the USAgymnastics for our state and they told me alert the judges of her deafness and they would take that into consideration when scoring - but that the coach will be allowed to be present and cueing her of when to stop/start. I'm not sure how that will go over (the "taken into consideration when scoring part") because I want my kid to be on an even playing field and not give anyone reason to take issue with it not being fair. On the other hand, with all the noise going on simultaneously during a meet, there would be no way she would know that her music has started...something that she just can't help. As many of you can already see, this might be a sticky situation if we should run into a wound-tight coach or parent. I just want things to be fair and still unsure what "fair" is...
As a judge, I would take this to mean that I would not take deductions for inappropriate coaching when the coach cued the gymnast to start and stop, nor would I be as concerned about if she was exactly with each musical cue. I would still judge all of her skills to the same criteria and look for a dynamic routine. This is similar to how I would make adaptations for any gymnasts. For example, I judged a blind girl a few times. I didn't worry about if her "focus" was in the right place, as she couldn't see to "focus" over her hand or up or down as required by the compulsory routines. I still judged all of her skills to the same criteria. Similarly, I judged a level 5 girl who had an undeveloped hand. The ruling from the state and the meet directors was that she was allowed to have a spot on bars for no deduction, as a safety precaution. I still evaluated her skills to the same standard, but did not take any deduction for her coach being there.
It's about being as fair as you can but not disadvantaging someone for something she has no control over.
The compulsory music, of course, is something you have no control of. However, as your daughter advances through the levels, music may become less of an issue. I don't know if she can "feel" certain music, but music with a heavy bass might be an option. She could choose music with a consistent beat or steady counts that she can memorize. She might chose to focus on the other events. Of course, these options are many years down the road.
Finally, the most a gymnast can lose in the compulsory levels for not being with the music is 0.30. In the grand scheme of everything a gymnast could do wrong, this is minimal.