Something for Nuthin’ is a gift.
People go through great gyrations to hide gifts, and sometimes they succeed. But a gift is a gift, and is taxable.
If the gift is proven, and it can be shown that efforts have been made to conceal it, it is fraud on top of evasion of taxes. This is when it gets really good...
......If the gift is proven....
At the very least, she is a nanny to the father’s child