A visual calendar that shows the whole week at a glance is honestly the game-changer here. Get a big whiteboard or print out a weekly planner and color-code it - like blue for in-person days, green for remote days. Stick it somewhere she sees it every morning, like the fridge or her bedroom door. We do something similar at home for other stuff and kids just absorb it way faster when they can see the pattern visually instead of having to remember it.
Beyond the calendar, build a routine anchor for each day type. On remote days, maybe she sits at the same desk or corner with the same setup. On in-person days, the night before she packs her bag in the same spot. It sounds simple but it actually trains her brain to switch gears without you having to remind her constantly. You could even let her help decorate the calendar or pick the colors - kids are way more likely to actually use something they helped create.
One more thing that helps: a checklist for each format. Like "remote day checklist: laptop charged, snacks ready, bathroom break before class" and "in-person day checklist: backpack packed, lunch made, water bottle." Laminate them or put them in sheet protectors so she can check them off with a dry-erase marker. Takes two minutes to make but saves you from being the nag who has to remind her of everything.