Is my 15 year old daughter a good writer?

I think she's an excellent writer but I'd like another opinion. Here is a letter she wrote to a veteran.
Dear honored veteran, I would like to start off by saying, thank you. Thank you for keeping me and my family safe, and for protecting everyone throughout the United states. Your selfless commitment to our country deeply humbles me, and makes me so grateful for everything I have. You have worked so hard, and given up so much to secure countless gifts for Americans. Thanks to you I can go to school, come home to a safe place, and sleep soundly at night. It is a debt that can never be repaid, only expressed in thanks. It means so much to be able to call myself an American, a name that comes with such pride and honor. I only wish every young person could be as lucky as me, to have all the security and blessings that I do. You have inspired me to try and achieve this wish. I hope to join the Peace Corps so that I might bring one person a piece of the freedom and safety that we have in America. I want you to know that you have inspired me all 365 days of the year, not just Veterans Day. I hope to seize the opportunities that you have secured for me, and I hope to do good work. I hope to one day look back, seeing all of the blessings I was handed, and I hope to see that I've done something fruitful, that I might know a piece of american pride. I hope to one day make you proud, that your sacrifice has led to something amazing. Once again, from the bottom of my heart, thank you.

Not every line in an iambic pentameter poem has to exactly match the strict pattern. Poets, including Shakespeare, vary from the pattern all the time, on purpose. It's not a mistake. It's a deliberate choice.

In fact, if you take a Shakespeare sonnet and scan every single line as u' u' u' u' u', then you're doing something wrong.

I would scan this line as:

i SEE their an-TIQUE PEN WOULD have exp-PRESSED

That is: u' uu '' 'u u'

It's extremely common to replace two u' u' feet with the two feet uu '' in an iambic pentameter poem. This two-foot combination is (confusingly) called a "double iamb."

Also, the fourth foot here is inverted: it's 'u instead of u' -- this is also extremely common in iambic pentameter poems.

EXECUTIVE SUMMARY: Your scansion is right. Yes, it "fits".

You're supposed to convert it into "prose," not "a prose." Prose is writing that is not poetry. Your question was prose. This answer is prose. This is not rocket science, darling. Just re-write it in "non-poetry."

Technically, if you just used the exact same words as the poem, but got rid of the line breaks and wrote it out as paragraphs, that would be "prose," but the teacher probably wants you to do a bit more changing than that. Paraphrase the story. Tell the story in the form of a non-poem.

Update : What is the most representative poem that Matthew Arnold has written? For example, if I could only read one poem by Matthew Arnold and you wanted me to understand his essence and what he is about, which poem would you refer me to?

What is a nice poem describing Autumn?

I am trying to get some basic thoughts and ideas, so that I can write something about the turning leaves and the feel in the air. I love the fall and would love some pointers. Thanks all. :)