Does Facetime and Facetime audio show up on ATT?

I always facetime and use facetime audio and my mom claims she can see it on ATT. Like she would pull up my call log to see who I've talked to and how long and she says she can see when I facetime people. I thought Facetime was a Apple feature and could not be seen on ATT call log. Especially when I use WIFI (which is all the time). Is this possible or was she tricking me?