Door opening problim

This is on my 69 dart,right door.Outside door handle is new about 2 years old.When Cindy goes to open from outside the button pushes in good but the latch seams to stick she kind of has to pull on the door to open,door closes very well.When she goes to get out no sticking opens perfect.i have tried to adjust the striker up down in out that does not help.Any clues were now to look.Cant have my lovely lady not get in.