Umm, in case you missed it, the entirety of Jose and the Pussycats is about feminism. The girls in the band have never-ending support for each other, and that's what drives the film and leads them to real success (and helps 'em save that day). Feminism is about equality, and much of that can start from fundamental human interactions. It's all about love for your fellow fleshy life-form, really!
A lot of feminist conversation is predicated on some weird subtext of misandry, and that's not totally the case. When we say Josie and the Pussycats taught us that boys drool, we mean it in a playful, targeted way. The movie is about an all-female band, a concept that is still something of a rarity in a male-dominated world. If anything, it taught us that women can do anything dudes can do, perhaps even better.
This is a bit more obtuse but the reason Josie and the Pussycats save the day (spoiler alert! Back away now!) is because they recognize the ills of a music industry gone awry. At the end of it all, their individual, loving and free spirits are what rid the world of its corporate shackles. This movie is pretty radical, if you think about it.
Self-worth and individuality sit close to each other on the awesome characteristics scale, but self-worth is a bit more specific: It's an idea based on self-assurance, on a lack of insecurity. The fact that the women of Josie and the Pussycats are so brave allows young women watching to feel invincible, too. That's an undeniable suggestion.