Here's my list. Some items repeated from above:
Diaper changing pack in it's own container (maybe your friend can make a nice little portable bag for this stuff) containing changing pad, 4 diapers, small pack of wipes, and diaper cream.
Sunscreen
Hand Sanitizer
Tylenol
Sippy cup
Snacks/drinks
Couple of Small toys
change of clothes
sweatshirt
small blanket for covering up napping baby in stroller or in case it gets cold
hat
Sunglasses if baby will wear them
something for my lips
Aspirin/pepto etc for me just in case
I leave all of this in the stroller and then I carry a small purse with me that has my credit card, ID, money, sunglasses, camera and a couple of snacks.
I think that's about all we take in with us! If you could have her make a couple of small separate bags that would be so helpful (one for snacks, one for diapers, and one for medicines!
Alison