Did Jephtah sacrifice his daughter to God?

Judges 11 vs. 39 – And it came to pass at the end of two months that she returned unto her father, who did with her according to his vow which he had vowed: and she knew no man. And it was a custom in Israel,

1. Jephtah made a vow to offer someone as a burnt offering.
2. It was also written later that Jephtah fulfilled his vow.
3. No where was it written that in fulfilling the vow, Jephtah killed his daughter as a burnt offering to God.
4. If you read Judges 11 vs. 38 39 carefully, you will discover that Jephtah’s daughter was a virgin and the implication of offering her as a burnt offering was that she remained a virgin.
5. Until she died,  she knew no man (Judges 11 vs. 39)
6. Jephtah did not kill her daughter but she offered her as a virgin forever to the Lord.