Hey you two

. As you know, I don't yet have a SD, so everything that follows is just what I've picked up here, and thought of myself.
As Cinderella said, you'd probably do best to get an end-of-the-row seat, and settle Boo down next to you. If you face her away from the screen, she probably won't even notice a lot of the effects. You might want to take you Mutt Muffs along with you, so she doesn't get too startled by any loud bangs or sudden noises. If you've got a blanket or jacket with you, you might want to consider putting this over her body, so she doesn't feel any of the water jets or bubble effects (you'll be in the air-con, so she should hopefully stay cool enough). Some of the shows have scent effects, though these probably won't be nearly as strong as some of the other interesting things she'll smell around the parks (like the turkey legs

). It might be wise to have either an empty seat, or a family member in the seat next to you, just in case she decides she needs to sit in your lap again (though that was her first cinema trip, so I don't know how she does nowedays); she's a big girl, and might end up leaning on your neighbor as well!
I don't know whether you're planning to get yourself a wheelchair /
ECV for this trip, but if you do, there will probably be some space in front of or beside you for her. If she's in front of your chair, she shouldn't get any of the in-seat effects bothering her, as these aren't fitted in the wheelchair spaces.
Spoiler alert! Text is in white, so highlight it to read it (apologies to anyone else who uses Orlando Blue Night, you'll have to just skip past this if you don't want to know!)
The special effect under the seats in HISTA is done with a jet of air, and a little piece of plastic cable the flicks against your legs (yes, I really am that much of a geek, that I've gone and examined the seats to find this out
). As this is attached to the bottom of the seat, it would probably be somewhere around Boo's head when she's in a down-stay.
Hope some of this helps!