If she really is whining and crying, as you say, then maybe she isn't well. See if your husband can look into this - it could be somethi ng fairly simple but a doctor should examine her to be sure. She might be lonely, or going through a difficult stage in her life. Maybe she doesn't actually enjoy playing with him, but only wants to be able to tell her friends about her wonderful grandchild. It's not a crime.
Some grandmothers are like thet.
They like to brag about their connection with the grandchildren. All it means is that they like to get to know the grandchildren. Just let it be. I'm sure you don't feal threatened or afraid of leaving him with her. As for her telling you how to dress and what to do, that's nothing new.