Good idea to avoid flying when there are big winds, but maybe not feasible unless sis is buying a last-minute ticket. Can't always predict Santa Ana winds way in advance. One could say avoid certain seasons, but may not be feasible if it's for a specific event. Looks like she'll have to take the risk of possible turbulence (at the very worse still not dangerous, just nerve-wracking to some) or go ahead and plan the much longer car or bus option.