All my older boas, including my Guyana hit a second growth spurt around 7-8 years. My Guyana was about 5.5-6ft,then ended up about 7.5-8ft at 10 years. My het albino Colombian did the same thing, about 7ft at 7-8 years, then just short of 9ft at 10 years. Yours isn't done growing, especially if she is a female.