| What I did with my babies was let them cry. It won't take long and I have to admit that 3 months is a little young for me, but like I said it won't take long. Maybe start with putting the baby beside her. Let her fuss when she does, but the baby will get tired enough to sleep. I think if you do this in small steps, slowly it will work. First try putting the baby beside, then when the baby's good with that, try the crib. Babies will ajust. It may take a couple of nights but it will work. The baby will learn and it won't be as nearly traumatic for the baby as it would be for the mom. Tell her to be patient. As long as the baby is not hungry, in pain, or wet, let her/him cry. Just be sure to comfort the baby too. If she could lay beside the baby and stroke him, that might help. She better solve this now, because it will only get harder.
I hope something helps. | 
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