Hi Joyce,
Both Vidaza and Revlimid often decrease the counts initially. That can lead to severe infections. Revlimid can decrease platelets and since your mother already needs platelet transfusions I don't think Revlimid is the best drug for her.
http://www.ncbi.nlm.nih.gov/pubmed/22211483
Why not continue with supportive therapy with blood and platelet transfusions + Neulasta for the low WBCs.
Kind regards
Birgitta-A