I don't think it necessarily sounds like a new relationship, and could just as easily be a recognition of just how unhealthy and stilted a relationship with someone on a different continent, with different dreams, different hobbies, and different plans had become. All too often you don't realise how miserable you've become trying to hold a relationship together (let alone present it as if it's healthy and what you want for an audience) until that weight is no longer on your shoulders.
That said, she could also be in shallow rebound joy mode, but I'd not leap to that after seeing just how unhealthy that relationship looked.