"if we were her"

       Is there anything wrong with how a theater critic put this?  He'd just seen a new play called "Buyer & Cellar" about Barbara Streisand; he and a friend both wondered after the show whether they'd recommend Barbara herself see the play now that it's in L.A. after a run out East:

                 "We both agreed that we'd skip it if we were her."

       I note the use of the object "her" after a form of the verb "to be."  Only subjects should be used on either side of a "be" verb; hence "if we were she" is correct. Does "her" sound any worse than "she"?  Probably not by much.  Either one is a bit awkward because "we" is  plural and "she" is singular.  Granting that, "she" is preferred grammar.

       Usage, however, by enough qualified and intelligent writers can justifiably influence what's "right" and "wrong."  What do you think?