She probably hasn't gained total control over her bladder yet, or maybe her bladder is still small. So I wouldn't worry yet. Especially if she's getting it during the day. Just be sure she has no water or liquids at least two hours before bed. Also make her go potty before getting into bed. This might help some. I don't think I would disturb her sleep if she's not waking on her own. At this point in the game, the only thing you'll accomplish is getting a cranky child who might become resistant to getting up. Especially since you haven't officially begun to night train her.
If down the road, long after you start working on "night" training, she's still having accidents without a good reason, I would consider purchasing a bedwetting alarm. This is a whole different ball of wax, and its assumed by then you might be dealing with issues such as a heavy sleeper, a weak bladder, or the inablity to feel the urge, and therefore a theraputic measure is needed. But as I said before, it sounds like it's too early for that in your case.
However, there are schools of thought that you want your kids to get used to responding to urges at night and to not empty their bladders before bedtime. Forgive me, I don't remember where I read that. I personally disagree with this. My oldest peed after being fully trained if he went to sleep with liquids in his system. Since we started taking care of this before bedtime, he's had no accidents, accept when he's ill. If he sleeps to heavy like when he's ill, he says he can't "feel" it and will miss his call. I believe him. No liquids before bed. It helps.