Type, or imply, Applejack's accent?

When I write Applejack's dialogue, I tend to spell her words using standardised spelling instead of "ah's" (I), and "-'in" (-ing). To me, using specific terms (e.g. howdy, partner) with the rest spelled in a standard form is adequate, because the reader should imagine Applejack speaking with her country accent instead of relying on an accent-ised spelling.

Is it better to use the dialectal spelling for Applejack's dialogue, or use standard spelling (so to make the reader imagine her speaking them in her accent)?