If your checked bags are a common colour it can be hard to spot them on the airport conveyor belt, so you can tie a ribbon or colourful label near the handle so they are more easily seen.
I can vouch for Avon Skin-So-Soft as a good oil to moisturise with that deflects mozzies. Be sure to bring an insect bite cream in case your DD gets bitten early and before you can figure out where the closest pharmacy is.
There are lots of Lidl shops in Mallorca (though not necessarily near your hotel) if you need to buy sun screen or towels at à good price.
I bought a bottle of gin en route to Morocco as very few restaurants sell alcohol there, and it made for a very nice and cheap evening drink - just add cold mixer feom the resort, for if you don’t have free drinks with your AI package. You might be inside quite early at night with your DD.
I do not like to do laundry on holiday so I bring exactly the number of outfits I need to wear one for each day, a couple extra T shirts, and a couple of dresses for dinner.
You can also buy a very cheap e-sim for local internet if you want to use your phone outside of your hotel wifi area with the Airalo app.
Swim goggles for the pool for your DD.
A sarong to use as a wrap, scarf, beach towel, etc.
A hair moisturiser if you have colour in your hair that might dry it out with the pool chemicals and sunshine.
Library app (Libby or similar) if you have a library card so you can read books and change them frequently.
If you have your passports, phone and a credit card (get a no fee for foreign currency one like Halifax does) ypu can pretty much buy anything else you might need while on holiday.
Have a wonderful holiday!