She's technically correct. You "pre-order" online for delivery, you make a "reservation" for in-store. You submit your payment method when pre-ordering, you're "buying" the phone ahead of time. When doing in-store pickup you're just reserving a phone. You don't submit any payment information. If you don't show up to get it, they offer the phone to someone else.
So "pre-orders" are for delivery and "reservations" are for in-store pickup. At least that's the way Apple's worded it previously.