fiancee is not eligible for ITIN
Certain nonresidents that are eligible are spouses of USC's that are not yet in the US but married the year they apply for the ITIN
https://www.irs.gov/tin/taxpayer-identification-numbers-tin
ITIN
An ITIN, or Individual Taxpayer Identification Number, is a tax processing number only available for certain nonresident and resident aliens, their spouses, and dependents who cannot get a Social Security Number (SSN). It is a 9-digit number, beginning with the number "9", formatted like an SSN (NNN-NN-NNNN).