[bewitched]

GD, I would assume Daniel told Locke about his mother since they were all together before Locke went back. Daniel seems to know that his mother knows how to get to the island. (Although I suppose Widmore could have also told him since he obviously knows where Eloise is.)

I'm curious why Ben seemed genuinely interested in helping Locke until Locke said he knew about Eloise Hawking then BAM!