What to do with ferral kitten?

I caught a ferral kitten underneath my neighbor's porch. I'm not sure if she is old enough to be away from her mom. However if I send her back out there she will probably always be ferral or get hit on the road because the neighbors feed them but never try to pet them or interact with them. I planned on taking her to the shelter in the morning. Should I put her back with her mom or take her to the shelter? I'm not sure what is best for her since I am unsure of her age.