Leaving dog alone?

So I want to start off by saying I am stressing out so much about leaving our 2 yr old dog at home (our wedding is June 26, 2021…so really soon!)
Now, she has her own room (our spare bedroom with a Queen bed that has a window right next to it so she can look out, automatic food dispenser that we will dispense through our app, water, puppy pads (she’s a rescue so she doesn’t go potty outside), toys, nayla bones, camera,chrome book that will playing music).
The longest she’s been in the room is about 9.5 hours when I’m at work. We have to leave her in her room for about 15 hours on our wedding day. I hate that we have to do this but she doesn’t like other people (the only 2 other people she likes are in our wedding party), she uses puppy pads, and we just got her a little over a year ago so i don’t want her to have any regression because she thinks she’s going back to the shelter, so boarding isn’t an option.
Do you think this is unreasonable or do you think she will be okay? We really don’t have any other options. 😫