That really.
Over the last year she's been woken up a lot by our dd2. Dd2 now pretty good but dd1 a nightmare!
She wants me to lie down with her at bedtime and whenever she wakes at night. Initially did it to comfort her for a little bit but now she doesn't ever want me to go and will just get up immediately after I've gone because she "can't sleep". Also would have a total meltdown if dh tried to settle her instead of me.
3 nights ago we told her that I wouldn't lie down with her anymore. I decided that I would give her a cuddle and then check in on her in increasing periods of time. Also have a reward chart. Worked fairly well at bedtime but I was in there for a long time....but then she was awake screaming for about 3 hours in the night because I wouldn't lie down.
Next night she was so shattered she slept well 
But tonight it's taken her 90 mins to get to sleep, again screaming.
I won't lie down with her because it was keeping her awake and she waking up for it in the night. But I Also don't just want to close her door and leave her to scream.
How the heck do I sleep train a 4yr old?!!
Also not sure how much of her reaction is about control and how much is anxiety. She says she doesn't like being alone at night, she's lonely, bored, scared of a sound in her ear (don't think there is one because she never mentions it in the day) and other things. In the day she has been more clingy the last 6 weeks as well.
I feel harsh because I don't sleep alone! Anyone think putting dd1 and dd2 in same room might help? Slightly concerned that might mess dd2 up again
So desperate and really dreading tonight! Any thoughts? (Please be kind, I'm exhausted!)