Girlfriend of 5 years says she needs time to find herself, what do I do?

I have been dating my girlfriend for 5 years. We have known each other since 4th grade and started dating our senior year of high school. We have been in a long distance relationship for 4 of 5 years we have been together.
We have often talked of getting married. We planned our wedding and looked at engagement rings. We even talked about when I should propose. We got really serious with this type of conversation over the last few months. Then we started getting kinda distant because I had finals in law school and she is busy. About to graduate from college and then one day she said she woke up and realized she didn't know who she was without me. It has been about a week since she has said this. She said she wants to take time to find herself without me and figure out who she is as a person. She says that maybe in 3 to 6 months we may or may not get back together. She says that we will be a stronger couple of we take this time. We are both 22 and haven't dated a whole lot of people. I just thought we were going to spend our lives together and I really think she is the one. I don't know what to do.
I'm afraid maybe there is someone else although she swears that there is not.
I don't know if I should give her time and then after a couple of weeks try and initiate it or wait to see what she does. I tried to talk to her but she really won't talk and won't see me in person. It's as if she has forgotten about the last 5 years. She has been going out with people who I assume are from where she works but she won't tell me anything and I'm paranoid she is going out to bars and making out with people.
I don't know what to do I have tried to talk to her and tell her how I feel but this just seemed to piss her off.
I'm not sure if this is her way of letting me down easy because she doesn't want this or if she truly just needs some time to be single. any advice on what I should would be great.
Girlfriend of 5 years says she needs time to find herself, what do I do?
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