Inviting the boss- dun dun dun

i2012do

I am loving hitting up this board today- glad you all are so welcoming.

So here is the deal:
I work in an office with a Boss, Me, parttime coworker, one day a week accountant, and brand new full time employee.

The only person I would invite to my wedding is my "part time coworker" she used to be full time and I see her and her husband socially about once every othermonth outside of work (at first we were closer, but some work Drams went down).

Now...my boss. It's a small company and she signs my paychecks. She keeps work and personal separate but recently we had an "incident" in my office and she got a bit closer to me (including offering me her carriage house during the hurricane when we lost power, and recenetly sending me in her place to this big fancy benefit for a charity she supports). I mean, I don't think she'd be offended if I DIDN'T invite her- but what is proper E. do I invite her since she is my check signing, nice enough, boss who i know she Won't come anyway. Or not invite her? 
I for sure know she won't come- she ill say she has some "society" event  or off on some fancy smanchy vacation- but I feel like maybe I should extend the courtesy. But yet, don't want to look like I am crossing professional boundaries.

Ps. I keep wedding chat to a minimum at work. Once a month or so the acct asks me what else i have done for the wedding (she lives int he town i am having my wedding in)....so no one is really "in the loop"