It's a hard thing to do. I too have lost a long-term resident here and it's been pretty awful, not having him around any more. You have all my sympathy x
I've only just seen this. I am so sorry for your loss but you did what all owners have the privilege to do and saw it through. What a wonderful age. I hope you can remember the happy times in the future and know that you did the one thing you were able to do for her. x