RealityOnes suggestion of performing for someone else and then having a discussion about it if she is interested seems appropriate. If she is interested that is, I can't stress enough that magic shouldn't be a major focus of the date. Obviously at some time you will talk about yourself and it will likely come up but don't drone on or let it dominate the conversation. One trick is enough unless she genuinely presses you for more. She needs to see you are not one dimensional, and by that I don't mean not only do you have a close up show but a stage act as well, I mean that you have other interests outside of magic.
If the magic you preform comes up organically that would be optimal, are you meeting somewhere like a restaurant or coffee shop? Does her field of study have any connections to magic, psychology etc?
All that being said if the date went well and she was receptive to you doing magic ending with the trick you mentioned wouldn't be a bad idea I think. Keep in mind I have been married 14 years so my dating advice might be terrible.