Hi Jen 3715,
It sounds like this would be fine. The reason why is that given you wanted a lift in the first place, I assume you were OK with your breast size in a bra. I don't know what size implants you have. Assuming they are a reasonable size, say up to 450cc, and knowing you are a G cup, it seems very likely that you will be fine with removal and a lift. However, only after physical exam can your surgeon know for sure.
Also, be very careful to discuss what size you were before the surgery and how you felt about that size. Even though you are too large now, you have gotten used to this, and the removal of the implants and drastic size change can be overwhelming. It is very important to remember how you felt about your breast size in a bra prior to the surgery.
If you were OK with it, you should be OK with just the lift; if you thought you were too small, you really have to discuss this with your plastic surgeon. Have several consultations and make sure you feel very comfortable with your plastic surgeon before proceeding with revision. Hope this helps.