Can she fill the space?

if you put her in middle, flayed her out, she'd easily fill space. they get nearly twice as large... so once you have 70%x70% (=~50%) it's likely good to go. if you flay it out like i suggested, i'd weave or prune where necessary. may need an extra cola here or there etc... use any tool at disposal to spread it out and even up height -- with consideration that anything cut might take an extra day.. maybe leave it a tad higher if given a choice. familiarity with rate of growth after various techniques will help keep it even. i'd have concerns about your height, so bend and/or cut her back down roughly to that net and go 12-12. however it works out best for even growth as mentioned above while also filling space of course.