If you went from a 9 1/4" pot to a 12", that's large enough for now. I'd be more worried about over watering with the soil type you have. i have a 6 foot f. benjamina that's in similar soil (not moisture control though). since the best time to repot would be around June, I've had to leave it that soil for the winter. But I've drilled a few hundred holes all over the sides of the pot, propped it up a few inches off the ground and installed wicks into the soil to help drain perched water (thanks to Al for all of that). Just saying, there are things that can be done to "get away" with that type of soil until a full repot can be done with correct soil at the right time of year. if the plant has spider mites, you'll see tiny brown, black or red specks. Look to see if they move. If the infestation is severe, check all other plants too. Spraying weekly with a 50/50 water / 70% isopropyl alcohol mix should at least keep their numbers down. But you have to really drench all of the fronds, top and bottom along with stems. Lastly, about the light, I know you say it receives direct and indirect sunlight, but as mentioned, if the plant is not directly in front of that southern window, it's most certainly not recieving enough light.

You may have to give up on the Majesty. These CAN be grown indoors with a major amount of work (need tremendous amounts of light and water AND humidity (rarely in existence in doors) and do really suck as indoor palms... do WAY better outdoors, and those that succeed tend to drag theirs outdoors for much of the year when warm enough. Cat palm sounds suspicious for another species... though 6' tall is possible, it is an exceptional Chamaedorea cataractarum that grows that tall (usually these are 3'-4' tall)... either a very old plant, or it's something else.

Agreed, I live in zone 2b so there are only about three months of the year when the weather is good for outdoor palms. I did have her outside for quite a bit before the repotting and when she was inside I had her in my living room which is basically all windows. I definitely will not be getting any new Majesty palms after this one but I'm really concerned about the pests because I do not want them to continue killing the palm and/or spreading to my other plants.

Hey Matt, thanks for replying, My greenhouse would be ONLY able to be heated to about 39F in winter. My local Lowes has them on sale for $10.00 now. The heat will come on at 39F and shut off at 50F. IF they are STILL on sale in about April or March I MAY try one at $10.00 each.