Nice to see an unmolested plant! 👍😎👍
Yes, amnesia has a high percentage of Sativa genes and this can lead to a long and slow flower maturation.
Seedsman do suggest a time of 85+ days, which means in the real world, generally another 2-3 weeks on top of that figure at least, so about 100-110 days might be in the ball park.
Really not much can be done, other than to continue your current care routine and wait patiently.
Sometimes dropping back the photoperiod by an hour can signal the plant to hurry up, especially slow maturing photoperiod Sativas with continuing re-flowerings (fox tailing), so this may work with an auto Sativa too. If by ninety days and she is still dithering, try going to 17/7 to see if that gives her a hurry up. It won't affect potency or yield, just signal the plant that time is running out for ripening.
If you are keen to try a killer amnesia haze, Sweet Seeds have both auto and photoperiod versions, their photoperiod one is pretty awesome and I imagine that their auto version would be too. If you go to my diary "how sweet it is" you will find some pictures of an amnesia haze photoperiod plant I grew a while back and this may give you an idea as to what to expect from this strain and from this breeder.
Hope this helps,........
Organoman.