Similar here - will do 7.30 or 8.30-11.30pm then 2am/4am/5am/6.30 (last night!)
I'm wondering what is changing with her, it's probably the nap schedule where she'll take a good 2 hr morning nap and will still want an hour in the afternoon. Which is great as it gives me time to do dinner and help the other 2 with homework. But not so great if it's affecting her nighttime sleep. SO I think I'll have to alter the afternoons somehow.
However she will sleep more soundly if she's beside me in my bed. Mmm. Teething is also a player too. So I'm tempted to just let her sleep with me for a few more months so we all get some proper zzzzzz whilst her teeth come through. Then I'll have to restart some sleep routine when she's a little bit more settled & older too.
Would love some tips though! It's HARD