Right side paralysis (haemiplegia), lack of speech (motor aphasia) and disturbed swallowing (dysphagia) can be caused by stroke. In cases like your grandmother's, a feeding tube is placed to support nutrition and prevent further possible complications such as gastro-esophageal reflux and aspiration pneumonia. There is nothing you can do to help her reestablish the lost functions of her body. Everything depends upon the stroke severity and brain reserves. The only thing you can do is to take care of her by: maintaining hygiene, massaging her body to prevent decubital wounds, feeding her through the tube as long as necessary etc. 4-6 weeks is an appropriate time for performing another swallowing test.