Rinne Sharingan is irrelevant, only jutsu she used with it is that Amenominaka.
and yomotsu hirasaka, and infinite tsukuyomi.
OT: Kaguya is still pretty strong with her other techniques just like Tauren said. Ash bone, 80 gods vaccum attack, nature manipulation, hair attacks, chakara absorption, the ability to turn into the juubi etc...
Now if you meant, "How strong was Kaguya before eating the chakara fruit?", then I'd have to say she probably had little to no power.
However, if that was your question and if this is secretly one of those Uchiha wank threads where Uchiha fans do all in their power to undermine anyone else that could possibly stand against them, then just remember this:
If Kaguya didn't eat the chakara fruit then there would be no Uchiha clan with sharingan.