Fluttershy has never been one to complain. No matter what Life threw at her, she'd pick herself up.
When Death is near, she'll accept it just like she accepted Life.
She knows her final moments are near.
Here is what runs through her mind, during her dying minutes.

For someone special. You taught me what peace feels like.
For another someone special. I know it's hard. But all will be well. Thanks for sticking by me. You know who you are.