My little Dumeril's boa, Rose who is usually the sweetest snake on the planet, has quite suddenly and inexplicably turned into a hisser! The first time she did it was last week and I wasn't sure she'd hissed because Ginger (the hissy bull snake) was in close proximity to my knee at the time and I thought it might have been her. I was also quite suprised because while I realize that almost all snakes can hiss I was under the impression that Dumeril's boas were usually not inclined to, especially my sweet Rose! I thought maybe it was because she was in shed and I'd startled her but that's not the case anymore. I'm really not sure what her problem is so hopefully somebody can come up with an idea. I have not been handling her a lot but I don't always handle her a lot because sometimes she's a problem to feed. I haven't changed anything recently about her parameters. I put her in a smaller cage because I'm getting her a bigger one but she's been kept in a snug cage before and is pretty sedentary anyway but she'd been in the small cage for awhile before the hissing started. Something that did happen was I dropped her the last time I handled her, which was right after feeding but it wasn't much of a fall and she seems to be functioning properly so I wasn't worried about it. Perhaps she feels threatened in the small cage when the big scary hand reaches in? I dunno I don't like being hissed at by her even though she hasn't tried to bite or even done an open mouth hiss, this is just such odd behavior for her that it upsets me I pulled my sleeves down so she couldn't get my hands and grabbed her despite the hissing and she's sitting in my lap wrapped in a piece of cloth quite calmly at the moment. What shall I do?