Very good question, its a peculiar call on both scenarios, she is the D, and totally outs herself when she is not desperate to, one in 15 to be whacked (ok realistically way less so, one of the handful likely whack targets as a C). Isnt a tactical necessity (except maybe if she feared being whacked tonight), way too early to be that.
And the other scenario, if she is a G, then she outs herself too, after Fred is lynched and shown to be G (and totally retarded to pull as a G, so very unlikely, civilians kill eachother off left and right, dont need to risk it to take down one). Either way, bit too soon of a card to play.