V.V.
I work with g-tubes. I understand it's a scary idea, but I think you'll be so relieved once your kiddo has one. Imagine no more fighting, cajoling, etc at meal times. No more worries about getting adequate calories into your kid.
The sugery itself is fairly minor, especially if they place the "mickey" button right away. If you all are going to be inpatient, be sure to ask your nurse for pain medicine every 3.5-4 hours. Pain is easier to control if you treat it before it gets bad. And if you all will be at home, be sure to give your kiddo the prescribed pain meds as often as you're allowed.
If your kiddo will be fed via a pump, the home health company who supplies the pump will come to your house (or the hospital, if you're inpatient) and teach you how to use it. All the pumps are basically the same, and trust me, they're idiot-proof.
The Mickey button is totally inobtrusive; no one will even notice it under her clothes.
Good luck!