Hello, Thankyou For Taking My Question. My Sister Had A

Hello, thankyou for taking my question. My sister had a stroke about 4 wks ago. She is home receiving rehap and is coming along with walking & using her left side better. But, recently, she has felt cramping aftr eating a meal. Now, it's every time she has a meal. What could this be. She is slightly overweight. & only eats one full meal every day about noontime. She has always been in good healthy & used to be a regular at the gym & rides her bike before the stroke.