Bachelorette Party!! HELP

Jessica
OK so this lady I work will is getting married July 1. Her Bachelorette Party is memorial day weekend. We will go to the winery and have some lunch. Then they're heading downtown for an overnight stay. I will not be going downtown with them, as it's a holiday weekend and I have plans, but I will go to the winery with them. My question is: do I bring her a gift? I will more than likely be the only one from work. Her and I are friends, not just coworkers. I plan on wearing a dress and some heels, I think. But this gift thing I'm just not sure of. Any advice is much appreciated. Thank you.