Thanks for your query,
Babies move through a sleep cycle
every one-and-a-half to two hours, where they briefly wake before nodding off again.
When mothers tune in to these night time awakenings... then he or she may not be learning how to self-soothe, something that is critical for regular sleep.
If you've tried everything and your baby is still upset, consider letting your baby cry it out. Crying won't hurt your baby — and sometimes the only way to stop a crying spell is to let it run its course.
Maternal sleep deprivation
is also very stressful & can exacerbater her depression
if there is any.
If there is genuine screaming & prolonged sleep interruptions she can try giving the baby pedicloryl syp in appropriate doses at bedtime for few nights , just to break the cycle.
Hope I answered your query.
Best wishes for mum & the baby.