Agree with HK.
Good that they are trying interventions now. I'd want to formalize it.
A 504 is for accommodations that do not require direct instruction (e.g. extended time on tests). IF your DD had an IEP, you could get push-in services from a special education person who could then teach her the necessary skills. I'd want maybe 10-15 minutes of services at the end of every day to teach the skills (as well as support at any other time that she's struggling), and once she'd mastered the skills, fade the support.