I doubt that she drove 2500 last year. Her current tires are 9 years old.Higher speed ratings(H in this case) tend to handle and brake slightly better while lower ratings tend to have a slightly more comfortable ride and a bit slower tread wear. Doubt you'll really notice a difference on a Corolla.
Personally I wouldn't worry about car tires aging out unless she's only driving 4,000 miles a year. FYI if she's driving somewhere with ice/snow those tires have pretty mediocre ratings for winter/snow driving as well as tread wear on Tire Rack.