the term used here is USED to fighting higher level beings, thus initially she was having an issue holding off his allies as they were much below the level she fought. It's not a weakness or downside, but merely familiarity or experience.
When she popped up the next time, she was strolling through them casually. It took FR outsmarting Griever to appear to have a chance, but given what Sue and Reed did earlier, she walked right through them and trapped the FF.
So at this point, we can't say she has the same problem she had earlier. its not a weakness or dampener when she clashed with them initially.