The 19-year-old started working with Maclagan, once a part of Andy Murray's backroom team, prior to the grass court season but has now opted to go in a different direction.
Their partnership started well when she reached the fourth round of Wimbledon but results have tailed off since. Left-hander Robson made round three at the US Open but is on a run of only three wins in four tournaments on the WTA's Asian swing that her seen her world ranking dip to 46.
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She posted on her Facebook page: "Miles and I have decided not to continue our partnership. I want to thank Miles for stepping in on quick notice to be my coach this summer.
"I have great respect for him as a person and coach and look forward to continuing our friendship.
"I will take a couple weeks off to refresh my mind and body."