Help with almost 4 year old

Hi ladies I need some advice as I’m out of ideas and about to lose my mind.

My almost 4 year old was an amazing sleeper. Didn’t really give us much trouble. Occasional bad dream but never really affected her after that night. She had a bad dream about a week ago and that night she was literally up from 1:30am to 5:30am and then up for the day 6:30am. Ever since that night she fights bedtime, wakes up nightly calling myself or my husband in multiple times a night, like at least 10. She will keep us up for 2 to 3hrs making things up to just have us come back in as I assume she doesn’t want to be alone. The issue is I have an almost 2 year old and a 4 month old that she tends to wake up because sometimes she will scream her head off if she doesn’t like our answer to her multiple questions.

We have told her to think happy thoughts before bed, we do nightly checks to show her her rooms safe, we have even talked about what that dream was about and assured her if wasn’t real. She has a nightlight in her room already and we leave part of her blinds up for extra light to make sure she can see everything in her room (her request). We have tried everything we can think of but we are exhausted and frankly getting really pissed off. My other kids are also effected and cranky from the loss of sleep.

On top of that she now has an obsession with her dad and when he’s at work or hell, even steps outside the home at all, she will cry for him which then sets my other 2 off. The other day she cried for 2+hrs and no amount of talking or distracting would help. It’s mentally challenging for all of us.

Any ideas would be helpful because Im at a breaking point as I write this at 2:45 in the morning back from my 297493 trip into my daughters room.