what causes low wbc, low neutrophiles, high lymphocyte% , recently low platelets?

Hi,
My mum had low abnormal WBC for many years, always her test results came back around 3.6 for WBC. Her platelets and RBC was ok. Her neutrophile% came back (35%-50%) and her lymphocytes came back around (30%-60%) . 9 months ago she was diagnosed with ovarian cancer and she had chemotherapy for 6 months. Now 3 months after she finished chemotherapy ( she is in remission) her WBC always come back around(2-2.8). Her neutrophiles around 26%, lymphocytes around 65%. platelets and RBC normal. But her last test result about a week ago came back with low platelets as well 122.
A month ago she had protein electrophoresis, the result on urine came back all normal , but the result of blood came back a small abnormality on serum paraprotein 1.1g/dL (increased gamma). The pathologist suggested a further test to be done to determine kappa/lambda ratio. At the same blood test was told she has vitamin D toxicity >150. with Normal level of blood calcium. 24hrs urine test shows calcium excretion.

What can be the reason for wbc abnormality? Is there a risk of leukaemia or MM? or other type of blood cancers?
Many thanks in advanced for your answer