Hi bud, nice looking mainline underneath . Yeah I'd say she's very stretchy, it's usually down to genetics . I have one pheno atm that I'm worried about as she's really stretchy too. I try to tie down the tops as much as possible as I have limited height . I'm not sure how much height you have but if she gets too tall maybe consider supercropping ? I havnt tried that technique yet . But I think I may have too on this run.
Other than your girl being quite tall I'm sure you will get a nice yield as she looks very healthy . Nice and clean underneath. Nice job 👍