If gentle, a transplant would be ok. But you'll have a little extra stretching as the roots explore the new soil, so the height issue will still be an issue. Plus, a larger pot will likely raise the plant a little taller, too.

I think I'd leave her in the same pot, as it won't be long till harvest. But I would take extra care to assure a slow pour when feeding or watering to allow as much absorption as possible when you do. Don't fall into thinking you need complete saturation daily, as this could do more damage than good. (root rot if too saturated for too long)

Perhaps a handful of fresh soil on top of your rootball. (an extra 1/2 inch of soil) might be all you need to retain enough moisture, and finish her off. But again...might be enough fresh nutrients in the soil to make her stretch a bit.

Don't top 'em.

Any way to move the light to the side and tilt (angle) it twords the plants? You can gain a few inches of height doing this.