Can anyone help me please ?

My sister has always had to get her way no matter what or who she hurts. Her daughter is getting married April 29 and most people I know have opted out due to the Covid 19 myself included. She texted me asking if I was going to be there with my kids. I said no as we are not vaccinated yet. I said my family won’t be attending , that was two weeks ago. So last night my 17 year old son let me know  she texted him and asked if he could drive my mother to the wedding (which is an hour and a half away ) and she is supposed to be driving her , it is her mother too snd her daughter wedding.  She said “ I know your mother said your not going to the wedding due to coronavirus  but your welcome to come !!  first of all she never talks to us throughout the year except at Christmas because she has to have us over or the grandparents would wonder! Secondly , and more sickening is that she knows we’re not vaccinated and that I said no! I think this is out of line very cunning and so selfish . I recall two months ago when my mom was in the hospital because her car had mold in it and she was having trouble breathing,  my son  and I were  the ones not her driving up and back from the hospital  and that night I texted  her to ask  if she could go let our moms dog out because she lives five minutes away in the same town and we live thirty five minutes away  and she simply said “ no I can’t “ and that was it . Am I wrong to feel that she overstepped her boundaries ? I’m feeling very  bitter .