Been there, your daughter isn't alone with these struggles. In fact from your description I wouldn't be surprised if she isn't alone in struggling with this at your school. Do you know other parents in her classes? Have you been to a back-to-school night and met any of the teachers yet?
DS had these issues in 6th grade and he had only one teacher. It was for a gifted class but keeping track of what was due when was complicated. Some assignments were assigned at the beginning of school either weekly or the book reports will be due on X dates. (One a week you will do X and turn in on Y day). Other homework was due daily, other stuff given 3-4 days. You were supposed to have a classroom buddy and if you were absent ask him or her for your missed assignments. (A social disaster for DS) And the teacher introduced each child having his/her own laptop/tablet in that class that IMO made things more confusing.
My guess is an adult needs to have a conversation with each of these teachers so they can get the rhythm of how the work is assigned and understand what is due when and the idiosyncrasies of how each teacher assigns work. This adult can be you or perhaps the resource specialist at school but it needs to be someone who has time to supervise her frequently. These conversations would be best done in person but if they have to can be done by email.
Good Luck.
