Many people misuse the word “borrow” instead of “lend”; although, apparently she got it right in the last sentence. My cousin always asks if I can borrow her a clothing item or says she borrowed someone ten bucks. It’s like no, but I can lend you my shirt and you actually loaned someone money. So basically the OP was saying she would lend the man a charger (which she also left out of the sentence) due to his phone being dead.