I'm going to a bachelorette party next weekend, and just realized I should probably bring a gift but I have no idea what! Or how big the gift should be...Or if I even should bring a gift in the first place...So many decisions!

Here's the situation:
-I am a bridesmaid... But, I can't go to the wedding--it's 2 weeks before my due date in CA and I'm in NY. So this is my one time to celebrate with the bride (she isn't having a shower anyway). The bride was my moh and was amazing for all of my wedding events/planning), so I feel really bad that I won't be there for her, but she's been so understanding and supportive about it.
-The party is out of town for both me and the bride, meaning it shouldn't be anything big in size since she has to fly and probably won't have room in her luggage. Plus, it's an out of town weekend thing, so hotel/food/etc for the weekend is already $$
-She and her fiance don't have a registry, so getting her something off of that isn't an option...

Any ideas? Help!