Colleague promotion

[Fairfax]

I would greatly appreciate some advice from fellow admin professionals.  I have a colleague who, years ago, used to be my admin assistant - a relatively junior post in our company structure.  She was promoted to EA to the Chief Executive, who happens to be my manager.  Her remit appears to be largely scheduling meetings for him and making travel arrangements, with some minuting of meetings.  She does not work at Board level. 

I am really pleased for her promotion as it is a big step for someone with no real prior experience at this level and limited education and training. What she lacks in experience, she makes up for in willingness and ability with computer packages. 

I can understand her natural pride in her elevation, but it is becoming more a case of "folie de grandeur".  We receive emails from her that are really dictatorial - polite requests are not part of her vocabulary, it seems - and hilarious offers to senior colleagues to "change my days of work so I can support you" at a Board meeting when no support is required nor is it in her remit.  Then she demands recognition for work she has done that in reality someone has then had to re-do as it was done poorly the first time.  I would hate her to fail and feel a certain protectiveness to someone who worked so closely with me at one time, but am cautious of intervening in something that is not really my business.

Have you encountered anything similar?  How did you/would you attempt to improve matters?

Thank you so much.