Oh no! Not another PT kitty that is going to the bridge! What a sad sad time.
Please know that you are doing the right thing by not letting Phoebe suffer any longer. You must feel very blessed to have had her in your life for so long. That doesn't make the letting go any easier does it?
Give her lots of love today and she will be in our prayers and thoughts as she crosses over.
God Speed Phoebe until you meet your meowmie again.