Am I being over sensitive?

i don't think that you are being over sensitive because you seem to have a bad gut feeling about what is going on . you need to let the last year go and forget about it,but do as you have been doing the last year and stay away from her to keep peace. and what your mother is up to is probably saying in her own way is let sleeping dogs lay. keeping peace is the best thing that you can do for yourself and your family because it don't do you or anybody else any good to keep this matter between you and her going. good girl!