We fly loads with C and recently came to NZ (and back again). All the airports are different, the airlines seem to be pretty same same.
Baby food is exempt from the 100ml restriction - you can even take bottles of water on with you if they're for the baby. As you go through security just tell them you have baby food and they usually don't even ask to see it (apparently going through Heathrow is different, they are stricter and want you to taste stuff but that's hearsay as I haven't been to London with C).
When C was 6m ish I used to take 1 nappy per hour of the flight and as many bottles as he would normally drink over that time period plus one extra. If your DD is having solids already, take the meals you need plus one extra. Some people I know prefer the squeezy pouch purees for flights but we coped fine with the jars
Maclaren do a REALLY lightweight stroller that would be great, I can't remember the name of it but there are loads - the ones with all the bells and whistles right down to ones that don't recline at all, have no basket underneath but just fold up quickly and are super light.
The stroller doesn't count in your luggage allowance so you don't necesarily need a lighter one unless you think the one you've got already will be too cumbersome.
HTH