If she's this good at lying about something so inconsequential, couldn't she be lying about other things...

Q:

My girlfriend of four months recently confessed to me that she’s been lying to me about her college experience. Basically, she’d told me she had a B.A. from a very good liberal arts school, but she just confessed to me that even though she did go to that college, she didn’t graduate, she actually dropped out during her second to last semester for mental health reasons. That’s fine, of course. What’s weird is that she’s been committed to this lie for the whole time I have known her. In ways she didn’t even need to! Like I told a funny story about my college graduation day, and she told a story about hers…..that never happened...