Dont know what to do anymore…

Yesim

My daughter still until this day needs assistance to sleep. We still rock her to sleep however it doesnt take super long. The issue we are facing for the past 2.5months is on any random night she will wake and not sleep for 2-4 hours when she used to sleep through.

At first i thought she was adjusting because we have a newborn but now that its been 2.5 months since I dont know why she is continuing to do this. Both my partner and I are sleep deprived and its becoming too hard to function.

Im thinking to do some serious sleep training and have her learn to sleep on her own and if she wakes i want her to not leave her room and manage to fall back asleep without the assistance from us.

Anyone have any advice please?? How can I help her get better at sleeping? Im really worried that the lack of sleep is going to affect her long term. Shes already a horrible eater and I dont want to know with those two combined what it may be doing to her health 😢