At six months, she'll just be entering her teenage months, so be prepared! For the next six months, more or less, the hormones will be raging. The good news is that after that, she'll settle down again - but it can be quite a ride while it lasts. At least it was with my first bunny, Scone, but he was a male. It could be different with females. Natasha was two when she came to live with me, so I missed her adolescence.
Her house should be as big as possible - at least tall enough for her to stand up on her hind legs, and at least twice her stretched-out length in width. If you can arrange a second level, that's even better. Natasha's a mini-Rex, maybe a bit bigger than a lion head, and her cage is one meter wide and half a meter deep on the ground level, four feet wide on the second floor (the cage was European, hence metric, but I built the upper level from Home Depot wire shelving that's sold in feet).