Just throwing this one out for the sharks before I give my opinion.
If we give XLN the benefit of YG's snake bladders such that she reaches Great level internal energy, how would another Great fight her? Please assume the other Greats are as we see them in the novel. No theoretical achievements except for XLN.
Her lightness kungfu is already top-notched, with abundant internal energy she'd be faster on her feet than any Great and last just as long.
Her Jade Maiden technique has a strong hypnotic effect and basically has no openings. Its attack power is not very high but again, abundant internal energy would make even a glancing blow serious.
I have some ideas on who could draw with her, who would likely lose and who stands a chance at winning. But let's see where people here would place her.