What misspelled word is in the sentence after sean wrote her letter she drew flowers around the border

Drew and border  shouldn't be capitalized. There should be a period after the word letter. And she should be capitalized as it's the start of a new a sentence.

Correct Sentence: After Sean wrote her letter she drew flowers around the border.

Explanation: Simply, the words drew and border should not be capitalized.

Hope this helps. :)