Indy my Sapphire Gem is utterly the friendliest bird I have ever seen. She is super brave, independent, loving and curious(hence her name Indian (jones)). I have Brahms and silkies both breeds known for their love of attention and affection and they don't even compare. I can make loud noises...
Does she only do it when you are talking to her? I think with their vaulted skulls some tones echo. Or possible wry neck if you have them on medicated feed, silkies can develop vitamin deficiencies.