I ended up explaining to mom that she'll see the others eating and will eat herself. Kids won't starve themselves and will become more flexible when hungry. And it's her choice if she wants to wean her now from the bottle in bed or when she starts daycare. So if she continues to argue the fact I may take others advice and state "my daycare, my rules, my policies are non-negotiable". Then she can decide if she wants to send her child to me