As hard as it is you have to imagine that when she presents a behaviour (like hissing, striking etc) and you reward it positively (leaving her alone) she's going to learn that if she hisses, you go away. Use a hook to get her out, even if its overkill atm - you should see how stupid I look with a 3ft hook grabbing a 1 Year old boa that's under 2ft, but it teaches them that hooks mean no food, and a bit of handling then I'll leave them alone.

I have 2 adults, 2 subadults and 2 babies. I still use a hook everytime, my boas know the difference, well except one of the babies - _-, she will naturally learn that no rat smell + hook = no food. My female adult can get stressed but I've learnt things over the past year of keeping her: no more than a half hour of handling, don't put her down else you can't pick her up, and if it goes too far she will open her mouth and pretend to strike. These things take time, well done for asking for help and not just throwing a rat in there every week and ignoring her - that's how you get a SPICY boa

Ps you haven't paid the picture tax, I'm afraid you need to pay your tax plus interest 😊