Try giving treats whenever you put the harness on, so she'll associate it with good things. Generally, I think, dogs quickly realize that harness=walks and they come around.
My old Westie was 9 before he ever saw a harness. At first he wasn't so sure, but soon he put 2 and 2 together and after that he'd get excited whenever the harness came out, because he knew he was about to do something fun.
Make sure that everything fits properly, of course. You should be able to fit 2 fingers under the straps, just like a collar. And check for any raw spots after walks, just in case.
My old Westie was 9 before he ever saw a harness. At first he wasn't so sure, but soon he put 2 and 2 together and after that he'd get excited whenever the harness came out, because he knew he was about to do something fun.
Make sure that everything fits properly, of course. You should be able to fit 2 fingers under the straps, just like a collar. And check for any raw spots after walks, just in case.