Yeah, it's more likely that the island is finished with Daniel - his mind healed earlier and the realization that his mother always knew that she was going to shoot him the closure for his Mommy issues.

Or, and - I'm not sure the writers can get away with another character surviving a gunshot to the chest - there's still more to Daniel's story than Eloïse could foresee - after all she didn't know Desmond's fate.