Well as they all say the odds are stacked against you in a really unfair way. Not only do the nuits not care about the Pulsers, they feel they are above them. Also the land on Sahova simply does not support much in the way of edible plants, and as a result what few natural animals there are are usually just as bad to eat, and what little you can eat has very little meat on it in the first place. Sure you can fish, but there is not a huge abundance as you might think in the waters surrounding Sahova.
So it will suck if you try this. Your PC will hate every second of it, get treated worse than you can imagine most likely, suffer a lot. Does that mean you should give up? Heck no

. I will tell you like I tell all my players. If you can MAKE IT WORK then we will see what happens. So the problems you will face are as follows:
1) Nuits rule everything, and their word is final. In order to do ANYTHING you will need to gain real power, and influence in the island. Much easier said than done, especially while keeping ahold of your humanity.
2) The Pulsers are broken. They have all accepted their fates on the island at this point, and very little can be done to change this. You will have to somehow find a way to make them realize that they CAN survive, and that they should try to make life better for themselves. Again not very easy to do.
3) There is very very little food, and what little there is is already being rationed out. The food on Sahova comes from 3 major sources: 1. Hunting edible animals (mostly rodents and some small birds) from around the island, 2. Fishing in the surrounding waters, and 3. what few edible plants exist. Some have already tried creating new sources of edible food on Sahova, but will little effectiveness. Things just do not take well to the soil on this little island. The things that do live are tough and hardy, not really good for eating. So somehow you will have to find a way to produce more food for the entire island.
4) By starting this new 'movement' Elsa will be making waves in the established hierarchy. That means she will most likely be targeted by many in power. That also means she will probably have to deal with the Silence.
So when it comes down to it she first has to gain rank and power, then make good connections, possibly get involved and on good terms with the Silence (if she can find them), get lots of support and prove that nuits should treat pulsers better, and THEN probably she can start working on making their life better. I say go for it. Nothing ventured nothing gained right? Just understand the risks, and do not be afraid to accept the consequences. That is what Sahova is all about after all lol.