Hi, my dad in my home country has a very aggressive brain tumour, diagnosed this May, after so many trial and error. He has the same symptom as your mom - loss of control of limbs (left leg) due to the tumour's location that was pressing down on the nerves controlling his limbs, losing balance (he fell in the bathroom). He showed this symptom in January, where he crashed the car in the garage when his foot pressed down on the gas pedal. He is now on wheelchair (May onwards) and had a radiation in early June. From thence, he took steroids (dexamethasone) to control the swelling in the brain - when he has 2 doses a day, he would be strong enough to stand up. But if it goes down to 1 or none, he's completely immobile. He has also become nasty with his words - but it could be due to effects of steroids - it wouldn't be your mom talking, it's the meds talking... I would say visit her as often as you can, and call her more frequently - maybe take time to talk about your dreams, your faith and talk frequently about milestones in the past. This gives them motivation. Also they lose a sense of time, and have to be reminded constantly (memory loss due to the meds). My dear mom who looks after my dad is very tired, it is not easy - if only I could fly home to help. 

Hi, my dad in my home country has a very aggressive brain tumour, diagnosed this May, after so many trial and error. He has the same symptom as your mom - loss of control of limbs (left leg) due to the tumour's location that was pressing down on the nerves controlling his limbs, losing balance (he fell in the bathroom). He showed this symptom in January, where he crashed the car in the garage when his foot pressed down on the gas pedal. He is now on wheelchair (May onwards) and had a radiation in early June. From thence, he took steroids (dexamethasone) to control the swelling in the brain - when he has 2 doses a day, he would be strong enough to stand up. But if it goes down to 1 or none, he's completely immobile. He has also become nasty with his words - but it could be due to effects of steroids - it wouldn't be your mom talking, it's the meds talking... I would say visit her as often as you can, and call her more frequently - maybe take time to talk about your dreams, your faith and talk frequently about milestones in the past. This gives them motivation. Also they lose a sense of time, and have to be reminded constantly (memory loss due to the meds). My dear mom who looks after my dad is very tired, it is not easy - if only I could fly home to help.