There is nothing mentioned at all, neither that she is incredibly strong, or any sort of comparison at all.

The only possibly significant statement is Cadsuane's belief that one woman can hold her shield, but she's posting two or more to be careful.

It need mean nothing, since it seems the original shield was woven by more people, and fewer are sufficient to hold her.

Since shielding is gender dependent, comparison to Rand, who needs 3 women to hold him, is also pointless.

I do however, take the absence of comment on Semirhage's strength to mean that no one is overawed, since they have been around Nynaeve and Alivia, both exceedingly powerful women.