I have been sent this link which can give more information in regard to Talking Angela/ Talking Tom
http://www.theguardian.com/technology/2014/feb/18/talking-angela-app-children-safety
This link should clear up any confusion, hopefully. Like all on-line resources it needs to be appraised by the carer and it's use moderated appropriately. There is a child setting which turns off the chat option in the Talking Angela app, as there is in Talking Tom and other similar ones from the same stable, but there is no way of preventing the child from turning it back on.