Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
Has your daughter spoken to the Centre Co-Ordinator and asked how it is going?
Why does your elder granddaughter think she will be taken away from her mother and which part of the UK do they live in?
Well that does change the concerns.
Has a safeguarding check been done on the new wife?
has your daughter identified an alternative Centre that can be used?
At this stage get your daughter to put her name on the waiting list of the other centre - it will be needed
I suspect that her father has indeed been telling your granddaughter all about how they will come and live with him and his wife - hence the distress.
If she has not already done so your daughter should use the CMS and get the payments sorted as soon as possible
If he does try for overnight contact then his wife will have to have a safeguarding check
I hope that things do go smoothly although I suspect otherwise