Put it in your grow medium now!! Dont transplant just stick into medium that you will grow it in.......It should have been done when the tap root came out.......
No need for this. It'll be fine. It's time to put her in dirt tho. You should be fine to use the MG Organic choice, I'd try and steer a little more clear of the moisture control, but it can definitely be used aswell. If you can I'd go buy some perlite and mix it in with the soil. Helps the roots breathe. And since it IS MG soil, do not feed ANY nutrients for a bit. She's gonna be fine with no nutes for about a month at least.