Perhaps the biggest variable is whether a large percentage of resident students live off-campus, since off-campus housing and food costs often vary by much more than on-campus housing and food costs.
Obviously, costs can vary substantially among commuter students as well.
Your D sounds like someone who is adulting really well… I tell parents who obsess about how their kids will make ends meet on an entry level salary “If they know how to put dinner on the table, and can push “start” on a coffee pot, they’ll be fine. If every meal is at a restaurant, and every morning starts with a $4 coffee…”