Is it exceptionally rare, though?
I'd say female murder is rare. Violent female murder is exceptionally rare. Doubly so female-on-male.
Given the lack of any indication of method, it could be non-violent, and that's the main reason I'd give benefit of the doubt that it could be really female.
The accused in this case has been released on bail.
And this is the other very likely possibility - the same as the case above. Arresting a person on the scene, on suspicion, but she's not the perpetrator. Again, given the odds, if the person on the scene is female, it probably wasn't her, but you've got to check, because it's not impossible.