Do not be concerned in the least if she did not thank you. You do not say what her culture is, but in many cultures saying thank you is just not a part of the way things are done. I worked for many years in a different culture and must admit that it took me awhile to understand that part of the culture. However, she will show her gratitude in other ways I am sure, saying it may not be one of them! In the culture in which I worked, it was taken as a given that if I had something and you did not, I would share what I had with you. I had to learn not to compliment people too much, because in that culture if someone complimented you about something that you had, you would give it to them. Enjoy the diversity and know that she appreciated it even if she says nothing.