Is there any way that you can take one of the classes over the summer.. either at Auburn or online or through distance learning? Otherwise, I think that it'd be best to go for the internship and take the late MCAT. The internship sounds like a pretty good deal and would look good on med school applications. Plus, you'd make good money!
On the other hand, if you really like the job you're doing now, then stick with it... since it's still research. Either way you'll be getting some research experience.