What does Patient management mean - what should I expect

HI, 

my sister has brain cancer - grade 4 transformed tumour. To date the chemo and radiotherapy hasn't worked. Two months ago, they changed her chemo to something more aggressive. Next week she has a MRI, results to be delivered 26th June - if the "new" chemo is shown to be working they will continue with treatment for another 4 cycles. If its not working  - its "patient management." what does this mean?

My sister is 36 years old, diagnosed in April 2017 following series of unexplained seizures. Two brain surgeries later, lots of treatment, OT, physio and epilepsy care intervention. Her life has changed significantly, complete 360 - but right now considering her circumstances she is doing brilliantly. Living independently with the support of a home care package  - she has capacity, doing the things she can, and working on the rest. I feel good that she is doing so well, but confused as I don't know what to do expect. 

Part of me thinks it doesn't matter what the chemo is or isn't doing, because compared to six months ago she's in a better place. Her mood is better, her motivation love of life returning. No more manic episodes. Whereas I'm not naive, I'm under no illusion my sister is "getting better" and "she's on the mend"  - she's just in a better place than she was. her quality of life 100% elevated  then it was when she was in hospital.   what does this term patient management mean? Will my sister just one day be as she s today then one day not. Will she just endure a long period of deterioration to her health. Will there be a prolonged unnecessary period of suffering. days, weeks of her being bed bound. I'm confident I know her wishes, I just don't know what to expect, not because I just want to make things right for her be her filter so she doesn't have to endure unnecessary pain, suffering and upset. I want I guess know what to do. ny advice, tips gratefully received

 Thanks for listening.  :-)