[quote=@ImportantNobody]
Now she could create weapons too large to wield effectively but use other creative applications for them, but this power you have is perfectly fine and balanced to me if she uses it in the intended purpose.
[/quote]

I think the key word here is "weapon."

In theory, a creation ability could be able to make a spear that reached the moon, but then it wouldn't really be a spear, would it? Just a space elevator shaped like a spear. And a sword dense enough to be a black hole would be a black hole more than a sword. A weapon by definition is a tool meant to be wielded, and I'll state right now that for the purposes of this character/fight I won't consider giant and/or completely bonkers objects as weapons.

In short: as a rule of thumb Tekla's power can't summon anything she can't wear as armor or wield with her own two hands.