If you don't enjoy spicy food, you are under NO obligation to use them. And those are very hot peppers, btw. They look like Thai or bird's eye chiles.
Find someone who really likes spicy food and give them away, or just compost them. And next time, tell your friend you're sorry, but you're just not able to use such hot chile peppers, and she should give them to someone else.
You don't have to tell her that you didn't use them at all. It was excess produce for her, she wasn't able to use them up either!