nooooo travel system!
Oy! What a nightmare that can be!
They're so heavy and cumbersome, and difficult to fold. (And you have to fold strollers fairly often for getting on trains/busses/trams - just to get from the parking lot into the parks).
She needs something she can fold with one hand, while holding the baby.
I highly recommend a Maclaren Volo - they are around $100 (some are on ebay, new) and they have a TON of wonderful features, including a 5 point harness for little babies like hers.
I also want to say that a Baby Bjorn can be a lifesaver at this age. Facing forward, the baby is content because they can see everything, and Mom's hands are totally free (and no folding and unfolding to get on busses and trams). If my almost-one-year-old wasn't so heavy, I'd wear mine to our upcoming trip nonstop. They're WONDERFUL. (Get them on ebay - for SUPER cheap or at a baby resale shop like Once Upon A Child).
Don't pack diapers, wipes, and baby food - get them at Wal-Mart, which is right down the street. It is a total waste of packing space, IMO.
Get a GOOD wide-brim hat for the baby - at least 3 inches - Old Navy has them for cheap and they will keep the sun off the baby.
Get a good sunscreen from a health food store. The regular ones are not supposed to be used on children under 6 months, but a baby exposed to that much sun will need something. I like Avalon naturals - we used the lavender one last trip which also acts as a natural insect repellant.
If the baby can't sit up in a highchair, try something like this:
http://www.amazon.com/exec/obidos/t.../104-0841249-1581540?v=glance&s=baby&n=547948
We invested in one three kids ago and have used it ALL THE TIME. It's so handy to secure a baby in a highchair when they tend to fall over to one side, or when the seatbelts are broken for a toddler (in a highchair)