But why would she just drop everything for someone she has acknowledged doesn't recognise her feelings? It's the same with Misty at the Cerulean Gym: There are more important things in life than following a ten year old kid who isn't ready for love yet.
Firstly: He is most-definitely not 10 any more.
Secondly: As Ash-ketchum said, why not?, if they really loved him they would have packed their bags and went after him. And we all know she loves him, is she up to the challenge though?...