IMO, i think it has nth to do with the milk she drank actually..
might be just a coincidence that it happened at the same time.
keep away your mamil mama, or label BIG BIG on the tin cover stating it is for MAMA NOT BABY.
tell your hubby NOT to ask his bro to make milk for your dear daughter anymore, either he do it himself, or you do it yourself.
might be troublesome for you to DIY everything, but better safe than sorry.
i suppose your brother in law doesnt have kids, might be confusing for him, so give him a chance.
even some parents also will blur if they r first time parents.
as of your girl, might be bcos you shouted loudly n gave her a scare..
OR, the mamil mama FM is causing some discomfort thus she is cranky n cant sleep well.
if you r really concern over this, you can bring her to a pediatrician just to check n make sure all is fine.