Nice work for such a small pot.
If your soil drains well I would flood her with lots of water whenever she looks like she needs it. If the extra water can drain out you should be fine. 2-3 gallons should be enough to saturate her soil I would think. I like to give a little bit of water, wait a bit (30-60 minutes), and water again. It seems to help it soak in more.
A bigger pot would be a good idea, but transplanting her would be a pain. Might take a couple people. Maybe think about cutting off the bottom off that pot and putting it into a hole in the ground. It would keep her roots cooler, keep the soil moist longer, and give her some room to spread out her roots.