If you were transferring to get just enough miles for a J ticket that's worth more, then it would be easier to justify transferring i think.
otherwise you are just buying 25K miles for $280 and losing on the miles and mqm's you would get by just buying the ticket
Unless you feel that you can get secondary gain by transferring control of her miles to you, for example so that you can later book a LAS trip under the guise of "it's free honey"