Thats because she thinking of the happy moments she'll later spend with the child. But yes, i agree the unknown is frightning to most humans. (yes, me 2...

)
But everyone fears pain as well. why do people fear spiders? well maybe some unknown.. but also the possibility of pain.
And it depends on the bullet and the gun.. how fast the gun can shoot.
Never underestimate fear of pain, my friend.
Who fears not existing? only those who have something they hold dear.
And loved ones who would suffer... but that is self pity on their side (off-topic)