Definitely go for the BPA-free bottles. They are recommending this for water bottles for adults and high school athletes so I would think infants would be even more susceptible to the toxins in the bottles. Given all the diseases and conditions that today's kids develop, going back to class like our parents and grandparents did makes a lot of sense. You can get them clean, and the baby isn't holding or at risk of dropping a glass bottle! Nipple choice varies a lot by baby so it's tough to guess at that ahead of time.
I think walkers and bouncers have mixed reviews from experts. I don't think wipe warmers are so valuable, and they certainly aren't portable. Be sure she leans toward some products that she'll need when the baby is older, and doesn't load up on stuff for the first few months and then be without - examples are clothes in larger sizes and also the shopping cart cloth liners for when the baby can sit up but you don't want him/her sucking on the last person's germs! I also think a Diaper Genie is fantastic - be sure to sign up for the refills too.
Another really nice item, though not necessarily made just for babies, is a mess bag (often called a lingerie bag) for throwing little items into the washer - great for socks, baby washcloths and other things that either get eaten by the washer or get lost in the dryer inside another item of clothing and not discovered for a while! Hang one of these in the baby's closet or at the side of the changing table, and just pitche the dirties into it, then zip and wash when the bag is half full. Keep a couple on hand - one to fill, one in the wash. I couldn't live without them - great for bras too so they don't get too beat up by the washer and last longer.
Also, I would NOT have your friend indicate any choices on clothes, bibs, towels, etc. - she's going to get a ton of those anyway, because that's what Grandma and Aunt Millie pick out, as well as neighbors who want something small "just to give" but don't take time to check out a registry.
She should absolutely go for a decent stroller and a good carseat, especially things that will grow with the baby. They are expensive but sometimes friends will chip in together. Obviously, she's not leaving the hospital without a carseat. Also, cheap strollers don't last. Washable covers for both are absolutely esssential.
A diaper bag with a good sized changing pad is important - many have cute little pads that are good for the first 2 months, and after that the baby is hanging off - not great in public changing stations.
Any kind of plastic link system that hooks toys to strollers, diaper bags and carseats is great - Discovery Toys had the first really great set, called Boomerings links, but now a lot of companies make them. There are vital - and I STILL use them to hang reusable grocery bags on the front of my grocery cart so the bags are out of the way but I don't forget them. And my kid is in college!!!
Good luck and have fun helping her plan!