I don’t think she was involved in actually shooting people and I do not think anyone else was actually shooting other than Paddock.
However, it would be odd if there wasn’t at least some hint this man was “off” or at least involved activities or beliefs that could point to a motive.
A recent report said she was “cleared of any involvement in the shooting” ...which...is a rather fine bit of word-smithery, when you get right down to it.