T.S.
Maybe she misses Hawaii and wants to go back? LOL! Just kidding, mama!
I think you have a combination of two things, most likely...
1) She could be beginning to teeth, and there are other developmental/growth surges that happen around that age. These cause distress in the baby, because of all the uncomfortable or unusual sensations going on, and that, in turn, leads to more "comfort nursing" and neediness in general, as well as inability to sleep well. By the way, "comfort nursing" is JUST as valid as nursing for nutrition--and keeps being a very valid way to sooth and support a young child long past the age where they move onto solid foods for their primary nutritional sources. So don't get caught up in the type of thinking that goes "she's trying to manipulate me". She isn't...she really needs you!
At that age, though, as she does move into higher levels of abilities and brain growth, she will probably sleep less deeply than as a brand new infant. Not just discomfort causes this. It is also caused by simply gearing up for more physical activity.
2) It may be that the travel interrupted her usual pace of things and you are still dealing with this a bit. I kind of doubt that it is the major reason, though. It's probably just a coincidental thing that you happened to take her on a trip at a time when other developmental changes were just about to occur.
Just curious, why aren't you ok with nursing her to sleep? I found that to be an excellent way to soothe my babies when they were this age, and it did not lead to an inability to go to sleep without nursing when they were tired enough. Sometimes it's the only way. I vote for doing whatever works at this challenging stage of her development, when all she can do is cry to let you know the multiple things that may be bothering her.