Also Musk already had his own poll along the lines of "Should I immediately step down as CEO?". The results were yes, and he ignored it for 6 months, then appointed some poor figurehead while he still continued to act as CEO.
Twitter would have looked great on her resume back when Twitter had credibility. She's been brought on to increase advertising revenue by making the platform look safe and professional, which is basically impossible with Elron stunting all over the place. She also already had a great work history, so I'm not sure how much it will really help her. She's as much CEO as Medvedev as in charge when Putin pretended to step down for a few years.