Hello eridia1019, standard texts(SMS) are shown in your billed text history and on your paper bill. While you are not able to see the contents of the text you can see when they were sent and to/from what number.
If she uses a texting application other than the default messaging it will not be reported.
Any texts sent with an iPhone using iMessage or, a downloaded texting application will not appear because the messages are being sent over a data or wifi connection. Because these messages are sent using an Internet connection they are reported as data usage rather than a text message.
*Edit for formatting
If she uses a texting application other than the default messaging it will not be reported.
Any texts sent with an iPhone using iMessage or, a downloaded texting application will not appear because the messages are being sent over a data or wifi connection. Because these messages are sent using an Internet connection they are reported as data usage rather than a text message.
*Edit for formatting