Acute Infarct - Stroke - MS Patient.

Hi, My mother is 54 and has been a Multiple Sclerosis patient since 2002. She had a stroke on Sep 16 and she was not able to speak properly and speech became slurry. She was diagnosed with Acute Infarct - Stroke (cholesterole deposits went to her brain as per the doctor's). She also got diagnosed with Pre Diabetics, and High Blood pressure. She got discharged on Sep 26 and it looked like she was on her road to recovery however on Oct 25 again her speech got slurry despite the proper medication and home speech therapy. In fact, this time her BP and sugar levels are normal too and monitored rigorously. Now she is not able to respond and almost 90% of the day she is quiet and 10% she speaks. She also has hard time reading a few words which she could do easily. How can I get her back to normal speech?