AIO when I get angry that my mom walks around even though she has major arthritis?

So my (26 F) mom (58F) has had major arthritis for 1.5 years in her left hip. She did not have insurance last year which is why she hasn’t had surgery. She does have a surgery scheduled for August.

Everytime she gets up, she moans and groans and sometimes yells because of her pain. She limps and has to take breaks if she walks too long. Every step she takes, she lightly sighs or groans. When she has to get in the car, off the couch, etc she goes “OOOOOOOUUUUUAAAHHHHHHH” really loud and really sad.

She’s forcing herself to go to our towns fireworks show and that means walking. It makes me SO ANGRY to see her limping and yelping and wincing in pain. I’m not rude to her really, but sometimes I do get aggressive when I ask her if she’s sure she wants to go. Am I over reacting to be angry when she forces herself to move and do these unnecessary excursions ? It KILLS me to watch my mom wince and struggle so bad. She’s getting in the car right now and has sighed / grunted 5 times