I disagree with most of this, especially the raisins. Chinchillas can't process sugar, so while they do love raisins, you're putting your chin's health at risk by offering them. Stick with a pinch of old fashioned oats, rose hips, half a cube of shredded wheat or a plain cheerio for treats.
Forcing any animal to be cuddly when it's not in their nature to do so doesn't build trust... quite the opposite, actually. Establish trust first. Exert dominance second. You'll need to be able to grab her for vet visits or in an emergency, but that's really it. Cuddling is very chin-specific, and I certainly don't think a chin should be rehomed for not being receptive to being held for long periods of time.
Moreover, by giving an angry chin treats, all you're doing is rewarding bad behavior. That chin will know that if she bites, she'll get cuddled, and then she'll get treats. It makes more sense to work with the chin on her terms to establish trust. When she jumps on your arm, give her a single oat. Use another oat to lure her up to your shoulder and reward her when she gets there. Tap a shelf in the cage to get her to jump down and reward immediately. Praise her when you give her a treat so that she begins to understand the different inflections in your voice. If you train her to understand what you want her to do, trust will be established and you'll have a much easier time picking her up in the future without the headache. They're prey animals and their instinct is to run, so it really just takes time.