Keep in mind that you were led to give to her out of love and caring.
Her response, or lack thereof, will be between her and her Lord, and really is no longer in your hands.
It's hard not to be human and need validation, we ALL do, but you have done well, God recognizes it, and He will deal with her if necessary. Perhaps you and He both will give her a love gift of time as well.
Try to let go as you remember you didn't give it to her for thank yous.