I love cats! but I ask you, why don't you adopt her? I have the impression that she doesn't live with you. You can sterilize her and she won't reproduce anymore. If there are only two kittens, it is possible that she would only have one father for the children. Several cats can "mount" the cat in a short period of time and the kittens can be from different fathers.
Thank you for stopping by and commenting.
I have already adopted two cats and a dog and I can't keep more animals in an appartment.
Otherwise I would take Curly home together with the kittens.