Orthodox Jewish folks please?

It is used by the Rabbis to show something detestable! There is a procedure called "Heter Nedarim" whereby one can annul a personal vow, after which you brign a "Korban Chatas" (sin offering) and the vow is annuled. this vow was a personal one and thus Jepthah should have nullified. In fact- Rashi in his cemmentary 11:39 states that after her death the comment "it was a statute" points out that the Sanhedrin heavily piblicised the law in such a matter to prevent it from ever happening again sine Phinehas the Kohen would have annulled the vow! he also states that Jepthah's life was cut short and died painfully from boils as a result of this action.