Trixie sounds like she might need a little more of a hands-off approach to bonding with her human friends. I definitely think the cage in your living space is a great idea. Instead of reaching in, picking her up, or bribing with treats, I would suggest letting her come to you first. With my little guy, I set up a pen and left his door open. I sat in the pen and let him come out on his own accord. Letting him sniff, run, and flop as he wanted (without any interference from me). Don’t try to pet her or really touch her while she explores. Read a book, play on your phone, etc. For me, this took a few days of sitting or laying in the pen before I tried reaching out to let him sniff my hand, and he eventually let me gently pet his nose. Some buns just take longer than others to realize we mean well. Hopefully, with some time and tasty treats, she’ll realize you are there to be her friend. Good luck!