There is no Watchtower Whitewashing.
"The text explicitly says that the vow was to offer her as a burnt offering and that Jephthah carried out his vow."
But it obviously does not mean that he killed her and burned her.
He meant that he would offer her to tabernacle service and that would be as a burnt offering that he would give.
NLT says "I will give to the LORD whatever comes out of my house to meet me when I return in triumph. I will sacrifice it as a burnt offering.”"
As a burnt offering means in place of. How could he give the person to the lord if it was dead?
ASV says " it shall be Jehovah’s, and I will offer it up for a burnt-offering." The person becomes Jehovah's and is in place of the burnt offering.
It is ridiculous that people would think that he would burn her.