I think probably that the unfortunate woman - who does seem to have behaved like a threat earlier, and attempted to run over the police and even hit a Secret Service officer - may have said something to them that indicated that she had a gun or explosives, or that she wanted to kill the President or some such thing. I think the conspiracy theories here have gone way off the deep end on this one, and I also think that portraying the police as people who just live for their chance to shoot someone is extremely unfair.
But I do think there’s a connection with the shooting and what Obama is doing now in things like shutting down our national monuments, because he has raised the level of tension and unease in this country to unprecedented levels. People who are insane react very strongly to their emotional environments, which I think is why we have had so many mass shootings by crazy people lately. And unfortunately, the police are going to be much more likely to shoot first and ask questions later when there is an atmosphere of simmering anger and violence, which is what Obama has created.
I have seen no report of what she said to the secret service agent at gate, so really cannot comment on that, but entirely possible. Would be nice to know.
I am not surprised one bit, that people, myself included, do not necessarily buy what the government or the media have to say on anything anymore. Why do you think conspiracy theories are so rampant in authoritarian, fascist countries as a general provable rule? It is a natural, organic, outcrop from being lied to over and over again by a state run media and fascist/socialist/Marxist/authoritarian governments.