Please don'l feel guilty about Star's passing. You have given her all the love you could, and she did appreciate that very much, by answering you with her chirping! She knew she was loved !!!
It is always difficult to know if and when a birdie is ready to go to the Bridge... . One day they are all healthy, and the next day they lay dead on the bottom of their cage. Don't blam yourself for not having known... .
It happened to our orange canary Fifi, many years ago... . I realise how hard this feels for you... !

RIP dear Star!!
Hugs to you Alysser!!