She looks a bit stretchy, but that's not much to worry about. I would try to give her some support (either by adding a bit of medium close to the base, or using a toothpick, chopstick or similar)..
How far away do you have your light, and is there any blue in the spectrum? Blue makes them grow smaller and bushier, but with closer internode-spacing, and not as stretchy. Same with having the light a bit closer. If they feel they don't get enough light, they will try to stretch for it. The internodes look ok, so i guess the light has been adjusted recently, and the stretching happened at the very beginning, could that be the case?
Lastly i suggest adding a fan for air-circulation that makes them "move" a bit in the wind (just don't point it directly and constantly on the small plant).. this also helps promote thicker stems, which will make it a bit more sturdier..