Welcome to MakeupTalk. Is the piercing really what scares you?
Sounds like she is concerned about any infections arising from any foundation getting into the piercing. I could be wrong... But like everyone has posted already, just avoid the tiny hole with make-up.
In Film and TV, sometimes it's unavoidable to apply make-up over the piercing. We just make sure we thoroughly remove any residual make-ups from the piercing before they put their jewelry back in.