I do warm up the mouse before giving it to her, I soak it in very warm water and it heats the mouse pretty even.

Its the bashing I dont want to do im sure when time goes by ill be ok if she does have to eat pre killed but I just need different ideas for the pre-killing. I watched this one video on youtube where he took hemostats and just clamped on the neck..... it actually looked better to me than just whacking it on the head