Okay buddy I highly recommend joining The forum so that we can help you out with future grows. Do not say a plant has colas unless it is already in flower, we call them tops. Colas consists of actual bud.
With that being said, if you start flowering now you should be fine without transplanting. I know big plants can be fun but I would personally start flowering it now.
Also if you have been vegging her for 10 weeks and she is 6 ft tall then I am taking it that you did not top her or do any type of trimming or pruning right? if you’re looking to get more Bud out of your grow I recommend joining The forum and learning how to train your plants to give you more Bud without having to grow them over 6 ft tall.
oh and dead leaves at the bottom of a 6-foot plant should be normal considering they’re probably not getting a whole lot of light. Once half to leave seems dead just pinch it off or cut it off.