First thing.For the formal letter,you need to to start with 'i want to state that' as it is mandatory in that place where she has to submit.
Second thing,i think she is mature enough to write 'i' as 'I' when she will actually write a letter.
Third thing is that,"PREVIOUSLY" is different from "IN THE BEGINNING." as PREVIOUSLY does not give us a idea about the actual timing,it just gives us the idea about the past thing so we don't know when thing took place in the past. and "IN THE BEGINNING" represents the actual timing when something started. so both were right as joint.
Fourth thing is that, when you are changing something, to emphasise that thing you can add 'RATHER' .that was what i did.
Fifth thing is that.you add 'THANKING YOU' instead of 'Thank you"
Sixth thing is that, 'KEEPSMILING' was my profile name so i wrote 'FROM KEEPSMILING'
I hope you might have got my points.