No, she NOT have any signing authority
My worry is that she knows people in the bank, and she is "highly" viewed by them and then she maybe able to get info on the account
For example, how much is the balance, how much i put on regualr basis and use that to go and ask for more/ higher monthly maintenance on the basis that I have money that i can put away for the child and she wants to have it
Whereas, from my side the idea is to save as much as I can for the child cause i will need that in future