It would be pretty hard to tell you what was going on with your date on this little bit of info. Also, we can't diagnose anyone here as we are all just peers in the realm of mental illness/disorders and relationship issues. We are not professionals.

I would say you would probably have to get to know her better and decide for yourself if she has any issues with mental illness or disorders. Maybe this is a good time for you to start a conversation with her about what happened and ask her if she's had other times when that has happened or if she is diagnosed with any kind of illness or disorder. From there, you can make your decision whether or not to continue seeing her.