At approximately 38:56 in this Episode where she goes into the Secret Headquarters in Russia when she is speaking with Sean Delaney her voice is very noticeably different like she caught a cold walking the 15 feet from the outside after leaving a voicemail for "Nico" where here voice was completely normal. The change is very very obvious!! Inside she can barely talk.
The woman in the cell phone shop is very obviously fake typing on her computer.