I would just keep doing what you're doing. Some animals take a lot longer to re-adjust than others.
I would include her name in "conversations" with the other cat but, I wouldn't even bother making eye contact until she makes the first "can we talk?" move.
When you say good night, be sure to always include her name.
As long as she is eating and using the litter box, you're doing the best you can do with her.
I don't even know what to say about giving up your bedroom to them. Many kudos to you
. Just let her come around in her own time, she may always be standoffish.
My tanker house cat is always wanting held and to lay on my lap. The tiny little thing that was heaved thru my locked driveway gate when she was barely old enough to be weaned, only wants attention from arm's length - literally. She does not want held but I may pet her from a distance lollol.
Meaning She has been here 3 or 4 years, so I don't expect that attitude to change