hello.please get your mom immediately examined and investigated by a physician.
such problems have various etiologies like electrolyte disturbances more commonly hyponatremia
you have also not mentioned whethwr she is been on some medicines as few drugs (esp anti hypertensives are known to cause such problems if taken for long time on regular basis.
other possibilities is a neurological problem which can give rise to symptoms like these.
also see that whether she has consumed any pills (sleeping pills) knowingly or unknowingly.
so hurry up.
all the best.