looks fine man, its time to stop watering constantly or you will get damping off and she will be a goner. dont be afraid to allow the soil to dry out it helps provide O2 to the root zones and helps the roots grow in search for water. just dont let it dry out to the point of death lol.
as far as transplanting goes it will thrive just fine in that container for around 2 weeks, want to make sure it has a nice healthy root system before you transplant otherwise it just makes a mess and causes un needed stress which will slow down growth. if you transplant at the correct time the plant shouldnt stop growing at all.
no nutes for 3-4 weeks
and make sure you have plenty of lighting, Mj is a light WHORE.....so if lighting is inadequate it will stretch and side branching will fall short.