The difference is really which syllable (jen-ta, jen-te) is stressed, right? Both have the same 'a'-like phoneme at the end.
And I think even if there is a small difference, in practice it doesn't matter... only if there was some other word close enough that it could be confused with.
Jenta is pronounced
/jɛntɑ/, while jente is pronounced
Pay attention to the presence of the indefinite article to help yourself in differentiating en/ei jente from jenta.