Yes, she did grab her crotch and smell it but, it should also be perceived as a dance move not, a way to check her hygiene in that moment.
In the article "Rihanna Baffled Fans by Grabbing her Crotch and Smelling her Hand in a Bizarre SuperBowl Halftime Gesture" The writers talk about this gesture that Rhianna is doing and it is simply just a dance move that a lot felt was inappropriate for families. In the article statesDuring her performance, there was a moment when the Fenty Beauty owner grabbed her crotch and butt before smelling and licking her fingers." most is taking this as a heinous act but she was simply just dancing. But since she is on the Super Bowl stage she is getting any and all contraversy even if its from a dance move that is to be "too sexy" for a Super Bowl halftime show