I would agree if it was Columbina getting knocked out. The fight ends with Dottore being knocked out though and then she dispels the dimension itself, which doesn't have to lead to her own energy physically keeping it up and running in the first place. In the second video, we don't even see her exert energy at all when summoning it, but we do see her make a special move in the first one so it seems inconsistent to determine her energy values from it.
Ultimately, I do agree the celestial bodies are genuine unlike the previous attempts, but what basis is there to assume she created the stars in the background and thus have Galactic range? The moon, I can get, but the stars behind them showing after she created a moon who's purpose is to darken the sky (and thus indirectly show the stars) don't need to have been created perse. Nor do I see any statement that her dimension