Advice on my Hogg Island please

[Niki]

I have just recently bought a Hogg Island, she is 4 years old and about 5 and a half foot. I held her on several occasions at the reptile shop while making my decision and always found her placid and calm. I have had her 2 weeks and her behaviour hasn't changed until I fed her 2 days ago. She took 2 med rats, after looking hungry after the first one, seemed to go into a frenzy striking at the glass when I walked by and looking agitated. Today she still seems p***ed off. This my first boa, I have 1 ball python and 2 carpet pythons and havn't experienced this sort off behaviour with them. Temps are high eighties she has a hide but has never used it. Is this normal? Any advice would be much apreciated