The Hypocrisy comes from her always bashing the NRA for spewing BS about guns (Which they do.), and saying that them and Republican lawmakers were "Complicit." in the Vegas shootings. In fact, pretty much right after the shooting she blasted the NRA in a Tweet. I guess that she didn't even have to wait for the facts to come out, or the fact that the guns were obtained legally and that he was stockpiling (Which most gun owners certainly don't do.). Not to mention the BS that she said about Bernie Sanders siding with the gun manufacturers instead of the children and families of the Sandy Hook shooting after he said that he didn't think that gun manufacturers should be sued. That's where the hypocrisy comes from.
Lying or twisting the truth is not hypocrisy. Hypocrisy is when you say one thing but do another. Were she secretly supporting the NRA, then there would be some hypocrisy.