she sounds like a normal boa, that is getting used to her new environment. Last night I moved a few girls into large vision cages from their sub adult tubs, and my typically nervious specimans were very frightened of their new home. I am sure these poticullar animals will calm dowm and enjoy the new space in a week or so.
I have also had boas that upon arrival after shipping were very nervious and aggressive only to calm down after adjusting to their new environment.
I also had a typically tame female get very nervious and strike at the cage, try to hide in the corner of her cage, while doing some majour renivation of my snake room with the new caging, there was allot of comotion that she was not used to so she got scarred.
So point being boas need time to adjust to a new environment, she will want to hide and be in a secluded lower light enviroment to feel safe also, no fish tanks.
Then nervious boas are most reliable with consistency, routine can make a snake prodictable, while new situations like noisy guest or other pets can make a normally tame boa nervious.
So game plan, make sure she is in an enclosre that she feels safe, secure and "out of view". Then give her a week or two, start to handle her a bit at a time, and try to read her as to when she might be receptive to this, not when she is currled up in the back corner watching you intently. Some times the boas are more active at night and the lower light has made it possible for me to hande boas that are always too nervous and frightened durring the day.
Lastly some boas are "dog tame" and are not affraid of us, or tolerate us very well. Others will remain nervious and wild. It sounds like since your animal was tolerant at some point when you first got her that there is a good chance she just needs some guite time to settle in.
Hope this helps
Brian Logan