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elevenism, be grateful that she's alive and can talk at all.
My cousin's wife had a stroke, she was fairly young, she was on life support for a few days, we didn't know if she'd make it. Finally, she pulled through but spent a long time in the hospital in rehab, learning to sit up, then walk. Now, she can walk, but slowly. My cousin, thank God, was able to switch his job to telecommuting so he can stay home and make lunch for her and stuff (she still can't do stuff like that, and never will). She can no longer communicate, at all. She can say THREE WORDS and the docs say that's the most they expect. Her brain can't connect with her communication ability. She knows what she wants to say, but can't make the connection. You can imagine how hard this is for a marriage of 25 years, or for their 22-yr-old son. My cousin and his wife have a picture book and she points to communicate. When she misses their son (he has his own apt), she points at his picture.
On the other hand, the brain is an amazing organ. Has your wife been back to a doctor to discuss this?