Firstly hugs to you! Its hard work doing all that feeding in the night! I think at 12 months its not a bad time to night wean. I would start by feeding to sleep, but then telling your DD that theres not more milk till the morning. If she wakes then offer water out of a cup and if possible get your partner to get up to her - its easier for them to handle if theres not milky boobs in their face!
All the best