It’s possible, but not probable, that she’d do worse on a retake: http://www.lsac.org/docs/default-source/data-%28lsac-resources%29-docs/repeaterdata.pdf The document shows that, of 286 people who scored an initial 165 in 2012-2013, 179 raised their scores, 64 of them into the 170-180 category. 36 had no change, and 71(around 25 percent?) scored lower.
Interesting doc - it also shows that 3 people with 179s actually retook. Hm. 1 went down, 1 scored the same, and 1 went up.