Honey - my opinion is that they are teething until 3yo, so I wouldnt wait but that's me:). It depends on you and how you feel what would you do and I would like you to decide. If you feel that it won't be ok to OT her to switch the routine as you feel she is in pain, that's fine. Can you clearly see when she is teething? I cannot with my DS - I never know if his NWs are because of teeth or something else:). And sometimes APOP and some habits which you developed during teething phase are having later effects.
My point would that you created this post as your dd is waking early. If you believe it is because of teeth, there is nothing we can do to help - it will pass soon. If you however think this is already a habit, let's create a strategy together how to approach it. Think it over and decide. Every decision is good - it's just have to be the one you believe in.
As a summary, even if this is teething or what kind of WU it is - at this age I wouldn't feed her at all until morning feed. It means that if she had BT feed at 6/7pm morning feed should 6 or even 6:30. Treat anything before as night waking and even if she is not asleep, she should be in her dark room knowing it's night time. It not only sends her the info that it's time to sleep but also even if she is not sleeping, she is resting in her crib. Would that make sense?