Kaminksi (if thats what it should be) is her maiden name.
it would have ended with an 'A' i.e. Kaminska !
It isn't one of our relations because the female married into that name although her initial was A and age wise was the sort of age you are referring too! She had two children , one boy and one girl. Maybe someone else can help by gving you some pointers as to where to do some research ? If you are in the USA then it is far easier to trace people than it is in the UK or in Poland.
Have you looked on your Mothers birth certificate (if it is your Mothers, mother ?) because your grandmothers full name will be in there. If it is your Fathers Mother obviously the same advice will apply.
At least then you will have your grandmothers full name which will be a great start I think ?
and I just googled the name Kaninski and there are Kaninski's about in the UK. So that surname could well be the correct one.....;)