Hi I had my Pfizer vaccine last week; I am 48 years old. First of all, vaccine is 95% protective 7 days after the second injection. I had some strong reaction, my arm was sour and I had flu-like symptoms for 48 hours but then it was over. Never had respiratory issues. Of course the effect / side effect of a vaccine depends very much on the individual background (i.e underlying medical conditions, demographic etc) in the end it provides protection to us and if the medical professionals advised vaccination for you mother then I would accept. Best wishes Cigdem