Hello friend! I wonder if it could be the 18 month SR too. Aaron has all of his teeth except the 2 year molars so I know our recent sleep strangeness isn't due to teeth. He isn't sick either so I feel the only conclusion has to be SR. For the past week and a half his sleep has decreased quite a bit. He takes over an hour to fall asleep at BT even though he's crying, rubbing his eyes and asking for "night, night", clearly tired. So his nights have shortened by 1-1.5 hrs. I've concluded it's developmental and the 18 month SR as we didn't really get an 18 month SR and there doesn't seem to be any other logical explanation. So, I've decided the best way to ride it out is to stay consistent so I still do WU 6:00/6:45 (I get him up no later than 6:45 but don't go in before 6:45), Nap 12:15-2(max 2 hrs), PD in crib at 7:00 and when he falls asleep, he falls asleep. He doesn't cry, just rolls around and takes an hour to fall asleep these days so typical time asleep for BT is 8:00.
If I were you I'd be tempted to stick with the same routine you were doing before but I wouldn't get her up before whatever time you are comfortable with her getting up. I wouldn't even go in her room unless she's giving you the "I need you cry". Eventually I think she should learn that if she wakes early, she can stay and play in her crib until mummy comes. It took awhile for Aaron to learn but now when we get EWs from time to time he knows that I don't get him up before 6:45 so he just quietly lies there, sits, or chatters and sometimes falls back asleep. Perhaps that would never work for Eva as she does sound more spirited than Aaron.
If it is the SR then once she's through it then she should resume her former sleep pattern. At least that's what I'm hoping Aaron will do.
However I could be totally wrong. And maybe it's her teeth - as canines definitely through Aaron for a loop! Perhaps Eva's teeth plus a SR are both contributing to the EWs and decreased sleep? It must be so tough being pregnant with those EWs. Hugs to you!!