I would chalk it up to checking her position. She wanted you to see her looking good and see how you would react. There was no legitimate reason for it.
Remember when you played chase as a kid? You would outrun your pursuer and they would stop and give up. So you walk back to them to entice them and the chase starts again.
I don't think what she is doing is spiteful, showing you what you would be missing. She is just checking her position. If you react to her, she knows she still has you so she can move at her own pace. If you don't play into her tactics, she knows she is going to have to come closer.
It can be a good thing she came by if you play it right.
M-40 W-33 D3, D4, SD13 T 9 YEARS M 5 YEARS ILYBINILWY APRIL 2012