In my opinion, 3 months in a lil too fast to be saying "I love you"! Jus my opinion. I was with a guy 8 months before we started saying "I love you" & our relationship lasted a lil over 2 1/2yrs. We been broke up 4 months cause he moved out of state, but now he is bck & we are trying to work things out btwn us! I wouldn't try to rush things, cause usually a relationship that starts fast, usually ends fast. If you really care about her, just let her know how you feel, but don't try to push it on her, cause you will only push her away!
Hope I was some help! Good luck with everything!
<3 Chrissy