Don't have a lot of time today so I'll try to keep this short.
My experience is that it is normal to wait a few weeks to get a 504 review.
Try to let her do as much on her own these first few weeks so the teachers can see what her level of ability. Document her struggles. My one exception to this is try to manage her anxiety around the situation. Talk with your DD and explain what you are doing.
Email/Communicate directly with her teachers to remind them she has a 504 and what accommodations are currently in place, and how you plan to manage the first weeks until the 504 meeting happens.
Check back with the counselor about the one accommodation my kids both got that can't be adjusted very easily later. That is getting preferential teacher picks. This can't always be managed perfectly but I bet the counselor will know what teachers would be more accommodating.
