I think what you have is a complicated situation - possibly part sale - part gift that is covered by Reg 1.1015-4
the sale part would be the value of her down payment the gift part would be the excess of the FMV of the property above the sale part. this affects you and her. in addition, if that down payment was a loan, she may have been required to to report imputed interest income each year.
others may have a different opinion
