I could see that if the baby was younger- at 10 months I would bet the baby would not just get smothered, 10 month olds are capable of moving their head, neck, shoulders easily- squirming- or pitching a major fit when in a bad spot. Most are even walking or about to- pretty mobile and vocal anyway at that age.
I can’t see her being the type of person who would go into a drunken raise and beat the child to death, but she might get drunk enough to pass out on the child and the child can’t do anything about it.
FYI the baby is now 11 months old .I believe she turned that over the weekend.