Stroke, followed by inability to speak.

Hello Doctor, Yesterday my mother while being bathed suddenly felt numbness in the right side of the face and body and since then is unable to speak (only sound). We took her to the hospital within 1 hour and after being treated in the Emergency she was shifted to  ICU. The emergency doctor observed it was TIA  probably. Today as I visited her, I found 2 things: 1. She could recognise me, which she wasn't in the previous day. 2. She could speak with very slight improvement and was able to open her mouth normally. Now the RMO( not the principal neurologist under whom my mother has been admitted) gave the opinion that it is a major stroke, for which my mother will not be able to walk or speak anymore. Meanwhile, they have conducted (CT SCAN+ MRI ANGIOGRAPHY+ a 24-hour Holter observation for ECG). It is pertinent to add that that there's nothing abnormal in the CT SCAN and Holter observation. Major strokes (bleeding) are normally detected in CT SCAN, then how can this be called 'major'?