Liza is royally p@ssed off about her scores compared to the young wonders in her own country. To see these kids come up and hit scores and PCS that she dreams about cannot be easy for her to take. Her sometimes snarky attitude should not matter. An old friend once said people are only human and when Liza is being snarky it is human and real.
The writing has been on the wall for years. We all saw this coming. Don't get why she's acting all surprised Pikachu.