hi Joseph I hope you guys have a wonderful time out there! I do eish my wife shared my passion for long distance hiking and backcountry camping, but tbh it’s a great time for me (and sometimes trek mates) to recalibrate , decompress from daily life and return refreshed with renewed vigor…
Cleanliness- Maybe have her practice her backcountry clean up routine a few times at home so she’ll feel confident attaining the level of cleanliness she’s comfortable with out there.  I use dr bronners and cherish baby wipes. For general around the body, feet and face but also with tiny bit of hand sanitizer for armpits, underside, and between toes… Pack out typical baby wipes with trash instead of burying in cat hole fer sure. I use Natracare Organic Cotton Baby Wipes they are 100% biodegradable and compostable, there are others. While most conventional baby wipes do contain polypropylene fibers they will break down to tiny bits after 100 years unlike say, ziplock bags that take 500-forever years… unfortunately Lots of things we use backpacking are non biodegradable, ziplocks, plastic buckles/ components, the gas and the plastic in the vehicles we use to drive there, food/ meal packaging, hydration bladders, Silicone impregnated nylon fabric…
Cuisine/chocolate – Have her choose a variety of snacks and meals, favorite  breakfasts,etc… staying satisfied and well nourished is key for me happiness wise
Caffeine- if she cherishes the ritual of coffee brewed in a particular style (I prefer pour over) don’t skimp and use instant, try to replicate what she’s used to doing so the caffeine levels are in check!
Like Jeffery said blister care and also blister prevention. If she feels a hot spot developing , investigate, try to cover that area (leukotape, KT Tape) Before the blister actually starts.  Some use Body Glide or other anti chafing stick on known trouble spots before heading out for the day. Thankfully I’ve found a trail shoe and sock system that has made long distance hiking/running blister free for me, Injiji thin liner toe socks underneath  1/4 length darn tough lightweight running. It makes for way less direct friction, the layers able to slide over each other. it also keeps in between my toes much cleaner than when I used to use a single sock…
Sleep- pillow? Maybe she could try sleeping with her intended set up (and new inflatable) a few times beforehand to acclimate and dial in a good nights rest…
Offer foot and shoulder massages! ;-)