I am very sorry for your loss you loss of your Tweety. They really do hurt our hearts when they die.
I would just give Sunshine some time alone and if she seems fine being a single bird then I think she will be just fine. My family has always only had one bird living with us. Boomer was very spoiled and very much loved life as a single spoiled rotten bird. My daughter has Tikki now who is alone and probably the most happiest bird I ever met. He is very vocal and loving (when he wants to be). I think as long as you take good care of your Sunshine and talk to her lots she will be just fine living alone with you.
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