I got a solution from other forum. Since it's mesh data in the memory you
can use only MDataHandle instead of MFnMesh.
hDrivers = data.inputArrayValue(MyDeformer.aDrivers)
for driverIdx in range(hDrivers.elementCount()):
status = hDrivers.jumpToElement(driverIdx)
if status:
builder = hDrivers.builder()
builder.addElement(driverIdx)
hDrivers.setBuilder(builder)
hDrivers.jumpToElement(driverIdx)
hDriver = hDrivers.inputValue()
hDriverMesh = hDriver.child(VertexSnap.aDriverMesh)
geoIt = OpenMaya.MItGeometry(hDriverMesh)
print geoIt.count() # Result: 121
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