i can see why you would think there may have been a cleaning but I'm also in the straight camp on this one.
the 79(S) are very common in higher grades with sharp strikes so this one is typical.
she could be a slider but I'm going with MS and it would fall in the MS63 box. the overall look of the coin is not strong for a 64 and not enough hits/marks to lower her to 62. imo the MS63 grade has the widest variances.