Amber trichs aren't the only indicator but yea its a good place to start. Look at the trichomes on the calyxes (bud) not the leaves. Those buds look very close to ready. Notice how its not really producing any more calyxes ( few new white hairs) and most the older hairs have oranged up and receded back into the calyx as they swell. Although I don't really like when people use flash because it tends to hide the white hairs which can lead to poor advice. From what I can see she looks like shes almost at the top end of what she'll produce. I say a week, week and a half left tops. I'd suggest lsting a little bit next time so those side buds can swell as well. Tops looks good though.