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Ah, yes. You are dealing with the typical single-jealous-miserable female friend. Those are never good. And she will not be happy until your girlfriend is single, miserable, and hooked on crack (just like her).
QFT! QFT!
May I suggest:
1) Start doing your own thing whenever this girl starts in on you two. If you're at a bar and the friend starts texting, turn around and start a conversation with someone. Go get a beer/water/whatever you drink. Etc. If your girlfriend sees that she is going to lose your attention when she responds to this relentless "friend" she will gradually become less inclined to do so. Then, reward her when she stops the interaction.
2) Spend a little less time with your girlfriend on a week to week basis. Let her have a few days a week to spend time with this friend, and make it clear that when you take her out on the town, it is about the two of you.
Whatever you do, don't react to this girl. You don't want to make your girlfriend feel worse, you want to separate yourself from this "friend."