Just confirming she gave birth to 16 fry, a month ago, and now she is skinny and bent?
How long has she been bent for?
Is she eating well?
What does her poop look like?
--------------------
She might have had complications when giving birth and is dying. She looks pretty bad and I doubt she will live much longer. I would euthanise her by wrapping her in a paper towel and whacking her on the head with a hammer. Do this outside on a concrete slab or block of wood then wash your hands and the hammer with warm soapy water.