If the fake statistics are correct and the suppression of any negative news about the experimental vaccines do not matter then your mom will be just fine. Unfortunately, my mother who is also in her 80s started having severe problems about a week after she got her first shot. She went from a very active lifestyle going to the YMCA and on long walks every day to not being able to get from her bed to the bathroom without assistance. She cries and tells us that she is in so much pain that she just wishes that she could die. She lost so much weight that she looks like a little death camp survivor.
Her doctors were no help at all and we all thought that she was going to die. After a month and a half she finally seems to be getting a little better, but at her age I do not know how long it will take for her to get her muscle mass back after getting so skinny.
Sorry to hear that. My 89 year old mother had two shots and shurgged it off. Around the same time two women in the assisted living in their 80's tested positive and they were fine too. The issue is a tradeoff of the risks. Among the whole population the shots seem to have 1 in a million to 10 in a million complications. Getting COVID results in about 1 in 100 complications.
But you also need to know your chance of getting COVID. That's very hard to estimate. Whereas your mother's chance of getting the vaccine was 100%. Finally you have to consider that everyone is individual and there's a pretty good chance that COVID complications and vaccine complications may be correlated for any one individual. In that case your mother or anyone else is probably better off with the vaccine.