Can someone without visible herpes spread it?

Im a little worried. I recently found out that my cousin contracted oral herpes over 2 years ago, but i saw her the other day and her lips looked fine. It scares me because i have been using her lipstick and sharing drinks. However, she never said she had herpes, but i understand because if i had it, i wouldnt want anyone to know. My lips look fine, and weve been going to the movies and sharing sodas for years. Again, her lips look perfectly healthy. No scars, redness, ick, or anything. So, if she did spread it to me, my question is how long does ot take for herpes to show?