Her reply letters are too short
Here is the process on how the letter exchanging typically works. You send the letter. It goes to the affiliate. The affiliate contacts the lady, (usually by phone) reads the letter and gets her reply, and translates it back to English. Then sends it back to you. This is why sometimes the lady's letters are shorter, they are relaying the information over the phone. However this is also the reason you get replies quicker. If you wait until the lady sits down to write a letter, you might be waiting a few days or a week. The ladies typically are very busy with school/work etc so our method works best for them and for you.