Toby was waking about every 3-4 hours as well and when he was about 12 weeks I decided I needed more sleep so I started trying to resettle him with a dummy. He's now only feeding once between 7pm and 6am, the rest of the time if he wakes he takes the dummy and goes back to sleep. It took a few nights to get it going but he's fine with it now.
I do think they get to a point where they don't necessarily need the feed but they have been waking for it for so long that they just keep doing it out of habit.
Obviously it's different for different babies, but you can only try and if she is genuinely hungry she won't resettle with the dummy and then at least you'll know.
Good luck