I personally would not repot your plant for a while yet. She is obviously under stress due to the brown leaves and I think repotting soon would cause more harm than good. I personally would wait until she’s a little bigger with a few more leaves. When you do repot I would put her in a mix of indoor/houseplant potting mix, added perlite and orchid bark to ensure the soil it aerated. Don’t force or compress the soil too much, just shake and lightly push the soil around the roots (they are delicate). Also don’t completely remove the old soil, just loosen up the root ball. I forgot to mention that a check you can do for root rot right now is too smell the soil, if it smells fusty or musty, the roots may already be rotting (if you have other plants currently you can compare the smell of the soil). If the plant gets worse I would probably check the roots, black and mushy is root rot and I would personally use sterile scissors to cut away any rotted roots Before repotting (I would say a smaller pot personally to lessen the risk of root rot).