It sounds absurd but I have heard of worse on this site and in life.
It seems outrageous that a Mother would allow this type of behavior but then again there are some horrible parents in this world,who have no business procreating!

I think it is better to err on the side of caution and assume this is a possibility.
Perhaps we can get this young lady to contact an intelligent adult who will help her to find an environment where she is safe.