"The Girl Who Waited" ends her story as neither a child nor as someone who waits.
"The Woman Who Kills The Doctor" doesn’t kill the Doctor at all.
"The Impossible Girl" is just a normal young woman who, given the chance, decided to save her friend.
Monikers in the Moffat era are often as much a place of deconstruction as they are of construction and consequently comparing or discussing them will rarely ever lead to satisfying results unless you take this into account.
"hi um i was rewatching the impossible astronaut/ the wedding of river song, and i was just wondering what are your thoughts on why river started shooting at her younger self in the astronaut suit if she knew that the doctor wasn’t really dead? then when she runs out of bullets she says "of course not." what do you think that means?"