In many parts of the world the heat is getting more and more unbearable, I totally understand you, I also suffer a lot from sleep problems and the heat takes away my energy to do everything I have to do during the day....
Really don't feel guilty or punish yourself for this, enough sleep is important for good health and to age well, and women need more sleep than men (I recently read a medical article about this, our rest cycle as women is different from that of men).
On the other hand, I congratulate you for having such a generous heart, even though the neighbor didn't trust you, you still decided to help her, I think you are a very good person. I would have refused her 😂 or I would have charged her 3 times the price (I give high prices to unfriendly or difficult clients to make them go away, and if they really want a job from me they will have to pay... over the years I have learned that my time is valuable because of the environment I live in where there are so many capricious people, you have to learn to choose your clients well).
I know that the economy of each country is different and when offering a sewing service you have to adapt to the prices of that economy, but I think you should charge a little more, your work is worth it 🙏 💵