I think you should stop trying to train her. It doesnt seem to be the right method for your particular bun.
Baby buns are very friendly and unafraid and easy to handle. When they reach puberty (puberty can set in from 3 months of age), they become a lot less interested in being lifted up and held etc.
To adult or semi-adult rabbits, being grabbed and lifted up is very stressful. Their deepest instincts tell them they’re about to become somebody’s dinner. This is a perfectly normal reaction for a rabbit, but it is indeed impractical for the human.
I think you should stop the handling and work on gaining her trust. Don’t grab her and pick her up unless you must.
Rabbits can learn to be handled, but by now she has rather learned the opposite thing. Since she panicks in such a big way when you catch her and grab her, her fear makes her unable to learn that being held is ok. It’s common for humans as well as animals to “go blank” in very stressful situations.
That she eventually gives in and calms down may be a fear response, and not a sign of relaxation.
Anyhow, you seem to love her very much, and she “forgives” you after a few days where you don’t grab her. She also seems to like your mother. These things mean you have the necessary foundation to build a good trusting relationship on.
I’m sure other members here will be happy to give you tips on how to bond with your bun. It is often a slow process, but it is very rewarding!
P.S: She’s absolutely adorable! 🥰