Thanks for writing in.
Your grandmother must consult physiotherapist having experience in neurological rehabilitation
techniques. Such exercises are individual based and need to be taught actively in the beginning. Then she can be taught the same at home.
Some exercises for arms are
Move the arm through its full range of motion at least three times a day.
Gently stretch tighter muscles to a point of slight discomfort.
Then hold the stretch for at least 60 seconds.
The legs can be mobilised slowly in the beginning while on the bed and progress can be made under supervision to walk with support.
Hope this helps