Actually I read up on how the Hebrews did sacrifices back then and it's interesting. First they would cut off the animal's head, followed by it's legs/wings and then slash it down the middle so the guts fell out.
Perhaps in keeping with the tradition first Jephtha stared into his sweet, beautiful young daughter's crying face and then chopped off her head. Next he hacked off her arms which she used to hug him an pray to Yahweh with hands clasped. Next he would have chopped off each of her legs that she used to kneel for prayer to Yahweh. Finally he would slash he down the midsection spilling her kosher food digesting guts on the ground all for the glory of Yahweh/Jesus.
While this seems brutal it is historically accurate and at least her suffering would end when her Father chopped off her head for Yahweh/Jesus before setting her remains on fire as a burnt offering as he promised Yahweh/Jesus he would do and Yahweh/Jesus eagerly awaiting the show and smell.
There you go Fundies I made it so the little girl didn't get roasted slowly to death for your god's enjoyment. I hope you are happy now.
It's your god not ours.