Platelets low and struggling to get them back up.

Hi my Nan is going through chemotherapy and is told her platelets need to be 100 to have this done. 

she is now 2 weeks behind on her treatment as they have been about 91-92. I was wondering if anyone has had the same issue and if so what you have done to help bring them up to have a consistent run of treatment. 

thank you in advance for any replies.