Claire on the phone
sounded different from Claire in person. She sounded more animated and upbeat on the phone. Same actor???
shareOf course this is the same Claire, except that she was acting with Virgil and on the phone she is being herself and probably talking to Billy.
shareI recall two phone calls, both was in the role of Claire and not being herself.
The real answer is that she needed to act more shy with someone around, so she did. It's natural she was more comfortable on the phone with someone far away from her physically.