No "proof" or timetable.... The implants taken out screenshots were literally taken during a festival. Look at the date the festival happened!
Other timetable- the LV bag she's holding came out late 2020 (I just looked it up).
Also not trying to be creepy but look at the sister's kid ages. They aren't time traveling.
Have you ever seen Ashley with a flat chest prior to this anyway?
I know it sucks but we don't know why Ashley got her implants removed. It could have been because of a health reason.
Many girls have to have their implants removed from BII and have to wait a year before getting them put in again.