Polo is a lovely cat, and foal farm have an excellent reputation. She looks fit and healthy. She'll be fine.
In situations like this, if it were a pal of mine, I would say "I'm sorry you felt you couldn't ask me for help..." and carry on from there. Whether you want to keep her as a friend is up to you.
But people by their very nature are fickle and trying to figure their minds, or getting angry with them, never seems to make you feel better in my experience.
Before you go telling her her fortune
if indeed that's what you've got planned, best remember the saying "Keep your friends close, and your enemies closer still." That way, you can keep an eye on the rest of her cats..