Oh big hugs! I hope you are taking care of yourself and your baby. Has your mother ever had surgery before and had a reaction to anthesia?
You have to trust that the doctors know what they are doing. They will be monitoring her from start to finish of the whole procedure.
I am a little bit younger than your mother but I have similar symptoms. I don't have pollups, I have something eles going on. I have had surgery a couple of times before and had to be put under anthesia. The doctors are very careful with it and only use what they need, they don't overload the body. They take body weight and medication a person might already be recieving into consideration before administering it. And after the person is out of recovery, they try to get the person moving as soon as possible to help get the anthesia worked out of the person's system. I know I hate being made to get up and move around a couple of hours after surgery, but it helps to get that anthesia out of my system faster.
Your mother is in good hands, you have to believe in that and trust that.