Please help with writing an advice letter for an employee?

I should write an advice letter for a girl who is working as a manager in our company. She has asked me to write a letter of recommendation so that she would be able to submit it to the embassy for her student visa. She is going to study management in another countryt to come back to our home country after 2 years of her master studies and continue to work here as a manager.
What embassy seem to require now is an evidence for her that shows she will come back to the home country to give her a visa.
I want to write a good letter (I have writen a recommendation letter before for her but this time what I should write is an advice letter with the context that shows that she will come back to the home country to work here after her studies in another country)

I want to write a good letter as she has been a very good employee.
Can you please suggest some good and assuring sentences that I can write in her advice letter for the embassy?

Thanks
 
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