Looking for some good advices. Anytime I get a child that cry for a week I know I will terminate or the parents pulled their child.

I started a new baby 9 month old this week. She came Tuesday cry all morning. She is only part-time three days a week. So baby A is here again crying. Baby A was home with the grandparents for two days so I can tell that she was spoiled by them and being held.
So this is Baby A today:
Arrived at 6:45am cried until 8:15am and fell asleep.
Woke up at 10am and had formula and cry then stop then cry.
She will not eat. Baby decided to cry from 11 to 12 herself to sleep.
She is raising her hand for me to hold her but she will still cry but if I walk with her she will stop. But it is all well for me to do it but I have four other kids in care that need me.
I talked to mom. Mom decided to put her in full-time for two weeks to see if she will adjust. Mom is working. Mom told me that she now start to put her down to cry it out to sleep. Not sure if it is true. But this child cry all day all the time. Please help me what to do or any advice