YOU HAVE MENTIONED 50/130 BP OR IS IT 130/50? if 50/130 is very unuasual case,now contrast CTdone ALSO normal means very less DAMAGE MIGHT HAVE TAKEN PLACE IN BRAIN, HOWEVER MRI
NEED TO BE DONE,LOW BP
might be due to secondary (left,most of cases) heart failure
following arrithimias developed by many more reasones eg left ventricular hyprotrophy,MI&MANY MORE ,see that HYPOTENSION
IS NOT good sign for any one,who had been suffering from long standing NIDDM&HTN,even for docs it is very challing to to get it to stabel BP,1)ONCE BP ACHIVED NORMAL SOME DAYS,2) HEART SHOULD BE IN GOOD CONDITION, ENOUGH TO PUMP BLOOD(DIAGNOISED BY ecg,echo angiogram etc) OUT OF HEART WITH HR70-80/MIN,SHE VL SURVIVE OTHERWISE GOD KNOWS,LET GOD BLESS YOUR MOM,ALL THE BEST.