T.S.
My 17 year old and my 11 year old have generally always gotten along pretty well, but there are times...and sometimes they act as you describe.
I have made it very clear to my older daughter that, while I really do appreciate that she is just trying to help, it upsets her sister when she feels bossed around. I let her know that I am the mama and no one else is.
It does help that the older one is herself a younger sister, the middle child. Though her oldest sister is living on her own now, I can help her understand sometimes by reminding her what it felt like to be the little sister and be told what to do--even if it was the right thing.
On the other hand, I do support my 17 year old, and always have, in giving help and suggestions to her little sister when they are appropriate and wanted. Many times they are.