Monique
If the pull-down blind sounds like an awning and you will a) be changing common property and b) changing the external appearance of the building, both of which will require permission.
But regarding the shutters, on what basis have you been told to get permission? Which of your bylaws requires you to conform to a standard and what is that standard?
If you have asked for permission in writing and they can't be bothered to reply, you can assume it's not a big issue. Send them a letter telling them what you plan to do then do it.
Regarding the “old bag” – she is just one voice and one vote on the Executive
Committee. You can assume that you're not the only person she's frustrated over the years so get yourself some allies then let her have her rant … then outvote her.