Adult rabbits as a rule really, really hate being picked up. It’s an instinct. Getting picked up means you’re about to become someone’s dinner.
That said, with time, most buns can learn that getting picked up can actually mean sth nice, like treats and cuddles. It will always have be on the bun’s own terms, though. If your bun struggles when being picked up – let him/her down on the floor again.
Continuous frequent picking the bun up for whatever reason can result in a form of flooding. Flooding basically means you overwhelm the bun. Some adult buns will respond well to this, baby buns will as a rule respond well. But the majority of adult buns will just hate it and either try to fight you or shut down.
Its quite normal for your bun to hate being picked up if shes more than 4-6 months old. It’s got nothing to do with you or how you handle her.
We still do have to pick our buns up now and then for nail clipping and wound care and the normal once-over health check. What you can do is to reward her when you’ve picked her up. Give her a yummy treat, then let her back down on the floor and ignore her. No nail clipping or prodding and poking, just give her a yummy treat (sunflower seed, half a raisin, thin slice of apple), then let her go.
It can take a very long time for your bun to accept getting picked up, but that’s perfectly normal too.