Redpilling your cousin is going to be a slow and arduous process. Nobody becomes and antisemite overnight. Start with the easiest to swallow pills: don't say it's the jews, say it's the rich. Everybody distrusts rich people and it's very easy to convince someone that a rich person has to evil plan to fuck up their community for personal gain it happens all the time, after all. Before you bring that to her, comb over her local media with the coincidence detector
https://coincidencedetector.com
and take note of all jewish names and their position of influence. Build a long list of every person involved in this bus gentrification affair and how they connect to each other. Then, after you've gotten your cousin to accept that there is a plot by the rich to destroy the local community by cutting off access to basic services, whip out your list and show her the disproportionate representation of jewish names and how they all mysteriously occupy the positions of highest influence. She wont jump to the conclusion that it's a global jewish plot to create a mongrel slave race, but you cam at least convince her that maybe its simple nepotism where people in positions of power and hiring others of their family/race, the kind of things all races are guilty of. That's a great jumping off point for more redpills in the future.
For bonus points, you would use a statistical analysis test of the z-test or t-test variety to quantify mathematically just how overrepresented jews are in the affair
https://en.m.wikipedia.org/wiki/Z-test
If you can show that it's statistically improbable for that many jews to get that much power through pure coincidence, that will go a long way to prove nepotism if nothing else. I dont know what timeline you're working on, but if this thread is still active in a few days im busy today and you can post your collection of names, both jewish and nonjewish, I would be willing to perform the analysis and tell you how likely it is for that % of jews to be in positions of power.
Also, is your cousin cute? You've fucked her, right? It's your duty to your race to impregnate her. Outside blood would just water down your family's genetics, after all