Doen't ring true, but in the absence of any real information I'll withold my opinion.
Homosexual marriage hasn’t been around long enough for there to be any sort of statistical sample to show something like gay fathers getting custody at a higher rate than straight ones.
However we do know that judges are bending over backwards to advance the cause of gay rights and marriage, something the author mentions. What happened to her can be seen as a logical progression of that.
Now, I’m not ruling out that there’s nothing else at work here. But there’s no evidence of it yet, and in it’s absence this woman deserves the benefit of the doubt.