Is it just my feeling or is she behind in flowerin...

Maybe a little small but looks fine. You always want to fill your pots to the very top with dirt. As you water and the plant grows the soil settles and usually drops a couple inches anyway. Your plant is barley up past the rim because it can’t get airflow steadily by the walls blocking any air movement in the tent. Try to roll the sides down a little now if your main stem isn’t long enough to add more media. Hope that helps and happy growing!!!