From trailer it is clear that she is very powerful, not likely but possibly as powerful as Revan himself. From beginning she executed force push that put unconscious three sith, which shows not only her force strength but ability to hide presence in the force to catch them off guard like that. Good at lightsaber combat but would never put her anyway near top for loosing her lightsaber like that.
However, she is clearly match more force talented, than Revan. From reading books the only person who absorbed lightsaber energy was Keiran Halkion but he got fatally wounded by that lightsaber before absorbing. Also, his descendant Corran Horn was capable of doing that. But both of them were limited from telekinesis use, yet she comfortably executes very powerful force pushes.
With this unique talent she is more than capable to face Sith Emperor, if she is strong enough to resist his mind influence and life draining.