Mother In Law Advice

So on Monday, I will be finding out my 2nd child's gender and I'm debating if I should invite my mother in law to the ultrasound or not. As a mom, if my child had a child on the way, I would want to be involved with my grandchild as much as I could. My husband and his mom aren't close at all. With my first child, she wasn't really involved at all until she was born but, I think she was nervous to ask if she could due to them not being close. I'm really stuck on what to do. I'm not close with his family either and we rarely talk.