All schools will look at your class schedule within the context of your school, so OP cannot be penalized when her school does not offer any AP courses.
If the DE classes are rigorous enough, then that should help. Overall the OP has done well all things considered with the circumstances presented.
Dartmouth is a reach to be sure for anyone, but there is something about the OP that I think could catch the eye of an admissions officer and result in a favorable outcome. Make sure to write good essays.