Conversation so far:
When did Elena Mukhina start as a gymnast?
Mukhina took an interest in gymnastics and figure skating at an early age. When an athletic scout visited her school, she eagerly volunteered to try out for gymnastics.
Was Elena Mukhina picked during the tryouts?

Question: when did she join the national team?
Self-contained rewrite: When did Elena Mukhina join the national team?