Hi there! I would decide when you are going to feed LO ( time of night or after so many hours) and NOT feed before then, no matter what. Persist with your chosen method of resettling until LO goes back out. Even if it is past the time when you would feed them. This way they know that just "turning up the volume" won't work but that you are there for them.
I would not advise waiting 3 minutes, I would just listen to LO. If LO starts out with an "I need you cry!" then get in there! If LO does mantra cry or is grumbling then I would wait indefinitely.
Can you practice in the day time with the water cup so she can do it on her own? Maybe she would need a nightlight for that.
If you suspect teeth, then I would offer earlier on in the night, to hopefully eliminate other wakings. Hope this helps!