I am so, so sorry to hear about Jesta. Please accept my heartfelt condolences.
I'm sorry to hear that there wasn't anything that they could do to help her. That's a terrible realization to have blindside you on a random Monday afternoon. I know how difficult it can be to lose a pet - they become your family. I suppose the up-side is that she was able to live a normal, happy life right up until the very end. Some animals suffer for weeks and even months and their owners are left to make the heart-wrenching decision about when and if to choose euthanasia. But from what you describe, it seems that Jesta didn't feel ill and she was able to enjoy life until very shortly before she died. I hope that you can find comfort in your girl's memory and know that she is now somewhere filled with love an joy, without pain.
If you are interested, there are support groups and discussion boards out there. Maybe you can find some comfort there. I'll provide you with some links for those, and some links about the grieving process for our pets.
Again, I am so sorry to hear that things couldn't turn out better.
Don't hesitate to let me know if there's ever anything I can do to assist you in the future.