Night before wedding?

With skincare/body items I would just be mindful to only get things she has used in the past and liked. The last thing she needs is a reaction to one of the products the night before her wedding! But I do think if she has a favourite moisturizing mask or eye mask that's a really good idea. If you think she'll take a bath then a bath bomb could work, but again I'd be mindful of what you choose just in case she has a reaction.

I would also include a bottle of champagne or another drink of her choice, some snacks, maybe some cozy slippers for her to use while in the hotel. If you're planning specific activities for the night like watching a movie you could include popcorn, or if you want to play games you could include that. I guess it might be easiest to narrow down the "theme" of the night and go from there because what she'll use will depend on what you're doing.