It's wonderful that you've been supportive in a time of crisis, but I do believe that now might be the time for your husband and you to set some ground rules and delineate the expectations you have of her while she and the baby are living with you. I get the impression that she is unwilling to impliment action to get child support from the baby's father. That shouldn't be an option under the current arrangement.

Also I don't understand this idea that if the baby's father buys some diapers, he somehow is doing his part. A baby needs more than diapers...like a warm place to live, care and supervision, food, medical care, transportation. All that takes money and it seem you and your husband have been providing all that for the baby as well as her. Diapers don't even begin to make a dent in what constitutes support.

As for her yelling at Cameron, she definitely needs to get a grip.